Windows Virtual PC requires hardware virtualization support. If you installed it on an older machine without running the virtualization support tool first, you probably want to remove it again. But there is no uninstall link, and Programs and Features in the Windows Control Panel does not show an entry, either.
Because Virtual PC installs as a patch through Windows Update, you can use the update console to uninstall it. Either select Windows Update in IE’s Safety menu, or click on “View installed updates” on the left in “Programs and Features”.
Windows Virtual PC is listed in the Microsoft Windows category (sorting by Installation Date will only sort within categories). Select Windows Virtual PC, then click on “Uninstall a program” on the left. A reboot is required.