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Select processors from Advanced Micro Devices do not support Windows 7 "XP mode" though, like Intel, the vast majority of shipping processors do support XP mode.

Microsoft describes XP mode on its Web site as follows: "As part of the upcoming Windows 7 Release Candidate milestone, Microsoft will release a beta version of Windows XP Mode, which allows users of Windows 7 Professional and above to launch many older Windows XP productivity applications directly from their Windows 7 desktop. The Windows XP Mode stand-alone feature is specifically designed to help small businesses that are using Windows XP applications move to Windows 7. For larger businesses, Microsoft Enterprise Desktop Virtualization (MED-V) MED-V 2.0 builds on top of Windows Virtual PC and provides centralized management of Windows XP Mode. MED-V 2.0 will be available in beta within 90 days of general availability of Windows 7."

"All CPUs AMD is currently shipping, except Sempron, include AMD-V and therefore support XP mode," an AMD spokeswoman said Wednesday.

AMD also cited processors that are not necessarily shipping currently. "With the exceptions of Sempron-branded processors and Turion K8 Rev E processors, all notebook processors shipped by AMD include AMD-V and therefore support Windows 7 XP mode," AMD said. "With the exceptions of Sempron-branded processors and pre-Rev F Athlon branded processors, all of the desktop processors shipped by AMD include AMD-V and therefore support Windows 7 in XP mode."

And Opteron processors: "Also, all AMD Opteron processors shipped by AMD from Rev F forward include AMD-V," according to AMD.

A quick search on Best Buy's Web site turned up very-low-end systems that use the Sempron processor. For example, a $329.99 Acer desktop is currently being sold with a Sempron processor. And on Hewlett-Packard's Web site, an HP Compaq dx2450 Microtower (starting at $329), for example, can be configured with a number of different Sempron processors.

Dell has sold laptops, such as the Latitude D531, with AMD Mobile Sempron processors.

An earlier Nanotech: The Circuits Blog post cited Intel processors that do not support XP mode. Intel spokesman Nick Knupffer asserts this won't be a big issue. "Having VT (Virtualization Technology) on these consumer laptops is not going to be an issue--because the consumer versions of Windows 7 (Starter, Home Basic, and Home Premium) do not include Windows XP Mode," he writes.

Microsoft has failed to remove a long-recognized Windows Explorer security risk from Windows 7, according to security company F-Secure.

The "hide extensions" feature, which was present in Windows NT, 2000, XP, and Vista, is also included in the Windows 7 release candidate, Mikko Hypponen, F-Secure's chief research officer, said Tuesday in a blog. The feature could allow virus writers to trick users into opening and running malicious files, he added.

Images: A peek at Windows 7 release candidate

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"In Windows NT, 2000, XP and Vista, Explorer used to hide extensions for known file types," Hypponen said. "And virus writers used this 'feature' to make people mistake executables for stuff such as document files."

For example, malicious code writers could name a "virus.exe" file as "virus.txt.exe" or "virus.jpg.exe," he said. Windows Explorer would then hide the .exe part of the filename, meaning that the user would only see "virus.txt" or "virus.jpg." Additionally, virus writers could change the icon displayed with the file in Windows Explorer so it looks like the icon of a text file or an image. Users might then click on the disguised file.

The blog post appeared on the same day that Microsoft had been scheduled to make the Windows 7 RC1 available for download to the public, although the OS release did in fact arrive early. Microsoft made its Windows 7 release candidate available to MSDN and TechNet subscribers Thursday. Microsoft hasn't yet given a release date for the final product.

Microsoft had not responded to a request for comment at the time of writing.

Tom Espiner of ZDNet UKreported from London.

Updated on May 6 at 6:35 p.m. PDT with additional comments from Intel.

A small brouhaha is erupting over Windows 7 and Intel processors. The hubbub is centered on which Intel processors will not support "XP mode" in Windows 7 and, by extension, which PCs will not support XP mode. Retail laptops may be one of the most prominent segments affected.

Sony Vaio laptops sold at retail stores are among a number of models from a variety of PC makers that have processors that don't support Windows 7 XP mode

(Credit: Best Buy)

What is XP Mode? Here's how Ina Fried of CNET News describes it: "XP mode consists of two things, the Windows Virtual PC engine and a licensed copy of Windows XP Service Pack 3 as a packaged virtual machine. Although neither piece will be included in the Windows 7 box, XP Mode will be a free download for those who have a license to Windows 7 Professional, Windows 7 Enterprise, or Windows 7 Ultimate."

XP Mode (XPM) is aimed at businesses that have Windows XP-specific applications that they need to run on Windows 7. XPM allows XP applications to run seamlessly on Windows 7, according to Microsoft. The catch: Intel processors must have Virtualization Technology, or "Intel VT," in order to run XPM. (I won't cover Advanced Micro Devices processors here but will address AMD in a later post.)

Ed Bott's Microsoft Report says that "some of the most popular PCs on the market today...won't be able to use the vaunted Windows XP mode in Windows 7."

Bott lists Intel desktop and mobile processors that will and will not support XP Mode here and here, respectively.

Intel mobile processors may be the most problematic in supporting XP mode; not because of the raw numbers--most newer Intel mobile processors do, in fact, support Intel Virtualization Technology--but because a disproportionate number of those that do not have VT (and therefore don't support XP mode) are laptops sold at retail. (And, undoubtedly, some small businesses purchase laptops at retail.)

In the Core 2 mobile camp, the P7350/7450, the T5200/5250/5270/5300/5450/5470 series, and the T6400/6570 do not support VT, according to Bott's blog. And this can be confirmed on Intel's Web site.

A quick glance at Best Buy shows a somewhat lengthy list of laptop SKUs (models) with, for instance, the T6400 (non-VT) processor. The list includes Dell Studio, Toshiba Satellite, HP Pavilion, Sony Vaio, Asus, and Gateway laptops.

In the $600 to $899 laptop range, I found about 30 different SKUs with T6400 processors, though it should be noted that some of these SKUs are simply models with slightly different configurations.

And a quick search on CNET Shopper turns up a number of consumer models with the T5270. The point? To state the obvious, consumers will have to verify which processor their laptop has.

In an Intel blog, Nick Knupffer asserts this won't be a big issue. "Having VT on these consumer laptops is not going to be an issue--because the consumer versions of Windows 7 (Starter, Home Basic, and Home Premium) do not include Windows XP Mode," he writes.

And Intel, in a statement, had this to say. "Intel introduced its Virtualization Technology in 2005 and has shipped over 100 Million chips with the feature. Windows XP Mode is targeted for business customers. It is available on the mid to higher end versions of Windows 7 and is supported in hardware by many Intel processors."

Intel continued: "Intel vPro technology PCs are required to have an Intel VT capable CPU and Intel VT capable BIOS. They are the best platforms for testing and deploying Microsoft Windows Virtual PC and Windows XP Mode."

ATI graphics drivers will now be delivered in one tidy package for both Windows Vista and Windows 7.

Advanced Micro Devices said Wednesday that it has released Catalyst 9.3, a set of new graphics drivers that constitute a "unified" driver installation package, with support for both Windows Vista and Windows 7.

One of the biggest changes for Windows 7 is support for the Windows Display Driver Model 1.1, an update from WDDM 1.0 used in Vista, according to Andrew Dodd, a software product manager at ATI. "(Catalyst 9.3) is one single binary and if you install the driver under Windows 7, it automatically supports all the WDDM 1.1 features. If you install it under Windows Vista, it supports the WDDM 1.0 features," he said Wednesday.

Dodd said ATI is trying to get out in front of the official Windows 7 release. "We're trying to show the world where we are with our Windows 7 driver development. From now on, every single monthly Catalyst driver that comes out will include Windows 7 support (in addition to Vista)," he said. Catalyst 9.3 can also be used with the Windows 7 beta, Dodd said.

So, what kind of improvements will users see? "With Vista, if you had really high resolution and you had a number of windows open, you'd get to the point where you'd just run out of memory. In Windows 7, this will become much more efficient as far as memory usage and you'll never run into that situation. You can have as many windows as you like open at any resolution," he said.

Other features that are seeing changes are the Windows desktop and the Aero interface. Under Vista, DirectX 9 was required. "For Windows 7, in order to have the WDDM 1.1 driver certified (by Microsoft), you have to have DirectX 10 hardware," according to Dodd. "The (Windows) desktop was actually designed using the DirectX 10.1 API (application programming interface)."

The ATI Radeon 3000 and 4000 series of graphics chips have DirectX 10.1 support, Dodd said. The Radeon 2000 series will also be "fully operable under Windows 7," he said, though Radeon 2000 won't support DirectX 10.1. One of the biggest advantages of having 10.1 hardware is its readiness for DirectX 11, which will be an extension of 10.1, according to Dodd.

Gamers will also see performance improvements, Dodd said. "In our internal testing we're actually, in a number of cases, seeing that games are running faster under Windows 7 versus Windows Vista."

In a news release Wednesday, ATI also listed other improvements, including support for the Direct2D API introduced in Windows 7, giving third-party applications the ability to improve ClearType text rendering and hardware-accelerated vector graphics.

Georgetown University is banning the use of the Windows 7 beta, informing students and faculty it will not support the trial version of Microsoft's latest operating system, according to a report in InformationWeek

The university's information technology group notes it generally does not support any beta version of software, unless otherwise noted.

And in the case of the Windows 7 beta, the Georgetown IT group reiterates Microsoft's warning that the beta could disable security software, as well as cause other hardware, such as printers and video cards, to function incorrectly, according to the report.

The university IT group, however, notes it will support Windows 7, once the final version is released and has been tested. Microsoft expects the final version of Windows 7 to be released at the end of the year or early next year.

Windows 7 beta is expected to be offered through February 10.

While much of the media is tripping over itself to mark the Second Coming of Windows (aka the Windows 7 beta), I am recalling the First Install of Windows Vista.

Although I have been running Vista without major incident since January of 2008, the initial switch in August of 2007 consigned me immediately to my own private Vista hell. Let's hope that Microsoft makes the upgrade to Windows 7 easier this time.

In a personal blog post written in August 2007, I wrote: "As more people experience the fiasco that is Windows Vista, I thought I would pile on. With trepidation, I upgraded to Windows Vista. My instincts were dead-on."

The upgrade from Windows XP went far beyond the typical upgrade woes: "I can handle the usual driver problems. But the last straw was a paid call to Microsoft that lasted four hours. I know that it lasted four hours because I remember being jolted out of the stupor of my support call purgatory by the phrase, "Thank you for being so patient over the last four hours." (For about two of the four hours, the Microsoft support person was remotely controlling my computer, and I was not present for much of that time.)"

Ordinarily, calling Microsoft for paid support is unthinkable, but at that time, I had little choice. "I had wasted so much time trying to configure Vista to work with some level of stability on my network that I just couldn't afford the additional time to figure it out on my own," I wrote. "Just so you don't think I'm an idiot, the Microsoft 'expert' had just as much trouble trying to solve my myriad problems as I did. In short, he was stumped."

In trying to think of ways to describe Vista at that time, I came up with my own code name for the program: Molasses. "The computer still hung in various situations and, to appropriate a phrase used by someone else, was like molasses. Also, as pointed out by fellow sufferers, going into standby is a crap shoot: the odds are 50-50 that you'll see the Windows desktop again. Vista seems almost ingenious at finding ways to hang, besides being just slow (I won't go into my docking-station woes)."

Reboots were excruciatingly slow. "Installing the constant parade of updates, which usually require a reboot, from various software providers can, alone, be excruciating, but Vista pushes this beyond the pain threshold. On my corporate Hewlett-Packard client (a presumably stable platform used in Fortune 500 companies across the United States), I can sometimes reboot Vista without incident, but more often than not, it goes into a 10-minute reboot holding pattern (with absolutely no indication from Vista about what it's doing)."

I had no idea what Vista was doing: "It may actually be using processor cycles to do something necessary, but you would never know it."

Granted, there were a few lucky people out there who upgraded with few problems. But I would submit that these few lucky souls used Vista on a relatively simple, straightforward workstation. Anything more complex--e.g. an IIS web server and a wireless network with a windows 2003 file server--and things could take on the consistency of molasses.

Windows 7 could be one of Microsoft's greatest operating systems, if it fulfills the promise shown by the unofficial beta version (build 7000) we have been testing for the past couple of days.

Let me preface these quick impressions of Redmond's latest opus by saying that I came to Windows 7 after having happily run the much-maligned Windows Vista on my Intel Core 2 Duo-based PC for the past 18 months (alongside Ubuntu).

I found Vista to be a worthy upgrade from Windows XP SP2. Despite its obvious flaws (can you say "resource hog"?) and the acknowlegement that some of its features need to be disabled by default, Vista at heart is a much more stable and usable operating system than XP, which was first released in 2001.

The release of Service Pack 1 and gradual driver improvements have built on Microsoft's somewhat-shaky Vista beginning.

Coming from this background, I have been pleased to discover over the past several days that Microsoft appears to have built on Vista's strengths and addressed most of its weaknesses with the beta release of Windows 7.

I found the a painless install. Out-of-the-box driver support on our test machine was perfect, and it took only half an hour and two quick reboots to begin running a stable desktop environment, though we wondered why Windows 7 created a 200MB partition in addition to its main partition. The 33MB of updates quickly came down the pipe upon loading the desktop.

Basic desktop performance was strong; the reports that Windows 7 is simply faster than Vista appear to be true. Certainly, Windows 7 had no problem simultaneously installing and launching applications, downloading files, browsing the Web, and carrying out other tasks on our modest 2.8GHz Pentium 4, which has only an 80GB IDE hard disk and 512MB of RAM.

Vista's most visible annoyance, User Account Control, has been pared right back on its default setting, and we encountered it only a couple of times throughout a whole morning of installing applications. However, if you feel nostalgic for UAC's old behavior, you can easily change it back via Windows 7's new Action Center, which now centralizes all of the security updates and warning alerts that Windows throws your way.

Windows 7 recommended that we install a third-party antivirus package (it suggested Kaspersky and AVG), but its antispyware package Defender comes preinstalled. Microsoft appears to have an antivirus package installed under the hood; when downloading new software with Firefox, we were told that our downloads were being scanned for viruses.

I particularly like the new photo-realistic device icons, and the overhaul of the way Windows handles and ejects USB storage devices. Microsoft appears to have wiped out a lot of the Windows XP-era interface quirks of Vista; the result is a much more simplistic, unified experience for common tasks.

I also enjoyed the overhaul of the Windows taskbar, especially the slick graphics, but a bug prevented us from being able to use the preview function (it showed a black rectangle instead), and you'll want to play with the taskbar settings to get this piece of the Windows 7 puzzle just right. It's easy to get minimized windows mixed up with launcher buttons, for example.

I want to stress that we didn't test the Windows 7 beta exhaustively, and business users will need to closely examine deployment software and how the operating system integrates into their existing environments, as well as its ability to work well with third-party software. For example, we couldn't get Adobe Systems' Creative Suite 3 to install on Windows 7 beta; the installer told us we needed to quit Internet Explorer first.

But perhaps the most important thing to note about the software is that at first glance, it has much more of that nebulous "Windows XP feel" than Vista ever did. Even on our modest machine, Windows 7 didn't thrash the hard disk or ever feel unresponsive, except when we were installing Apple's iTunes, a notorious pain on Windows systems.

In general, this signals that Microsoft has spent a lot of effort with Windows 7 on delivering a solid operating system that won't "wow" anyone but will satisfy them on a much deeper level. In other words, just what the doctor--and the customers--ordered.

You can find a lot of further Windows 7 analysis on the ZDNet.com blog of Adrian Kingsley-Hughes, as well as our own photo gallery here.

Renai LeMay of ZDNet Australia reported from Sydney.

Some companies are planning to skip Windows Vista, and that's OK, according to Steve Ballmer. But Microsoft's CEO hopes that those companies come back for Windows 7.

Ballmer said that "if people want to wait they really can," ZDNet's Larry Dignan reports. "But I'd definitely deploy Vista," he said.

Steve Ballmer speaking at Gartner's Symposium/ITxpo conference on Thursday.

(Credit: Gartner)

Speaking on Thursday at Gartner's Symposium/ITxpo conference in Orlando, Ballmer defended Vista and noted that "The adoption rate of Vista is faster than the adoption rate was of XP at two years in."

Ballmer did note that Vista has had compatibility problems with some applications and hardware, but that those problems have diminished. "We had a great success with security and starting to see a ramp with adoption."

Gartner analyst Neil MacDonald countered with Gartner survey data showing that 61 percent of respondents are thinking about skipping Vista altogether. Ballmer said that Microsoft would be ready for that outcome and reiterated Microsoft's pledge that Windows 7 will be compatible with Vista.

"Our next release of Windows will be compatible with Vista. The key is let's get on with it. We'll be ready when you want to deploy Windows 7."

Ballmer also responded to questions about whether Microsoft would revisit its offer for Yahoo, given the drop in Yahoo's share price. "We offered $33 bucks (for Yahoo) and it's $11 today," said Ballmer. "It's clear Yahoo didn't want to sell. They probably still think it's worth more than $33 a share. I still think it makes sense for their shareholders and ours."

Finally, Ballmer again teased Microsoft's upcoming cloud OS announcement, which he said will take place at the company's developer conference in Los Angeles at month's end. "We have a big announcement in two weeks at our Professional Developers Conference and we're going to run through this stuff," said Ballmer. He said it's critical that Microsoft has a platform in the cloud.

Click here for more news on Windows 7.