Secret: Windows Virtual PC is available in separate 32-bit and 64-bit versions.
Make sure you download the correct version for your PC.
And you must be able to enable this functionality in the PC's BIOS.
YOUR problem If you did not do anything unnatural that a firewall might have picked up as a virus, then you might have an actual virus that your outbound firewall blocked.
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Whether you’ve replaced your hard disk with a big chunky SATA one or decided to downgrade to XP from Windows Shitsa (eh, of course I mean Vista) then it’s likely you’ll come across an issue where you are either prompted by Windows XP setup for a floppy disk containing a driver or setup simply bombs out with a blue screen of death (BSOD).
The reason for either of these annoying interruptions is that the driver for your hard disk simply isn’t on the Windows XP CD….bummer eh.
Best of all, in such cases, users are often less apt to notice any performance issue because older operating systems tend to require fewer resources anyway.
Figure 3-12: Here, you can see Windows XP running inside Windows Virtual PC on top of Windows 7.
Looking for a way to play old DOS-based games under Windows 7? In Windows 7, the Windows Virtual PC virtualized environment—shown in Figure 3-12—plays a special role.
Because new versions of Windows are often incompatible with legacy applications, a virtual machine environment running an older version of Windows and those incompatible legacy applications can be quite valuable.
That said, for the best results, anyone utilizing Virtual PC to run an older operating system such as Windows XP along with whatever set of Windows 7–incompatible applications is well served to pack the host PC with as much RAM as physically possible.