HP m9715f. Win 7 Professional. I knew my comp. had hardware virtualization, but it didn't occur to me to check to see if it was enabled. I installed Virtual PC and XP mode per MS's instructions online. It works dandy (though I haven't really stressed it yet). *Then* it occurred to me to peek into the BIOS settings on startup. Lo and behold, "virtualization technology" was disabled. The description seemed to be saying it's better NOT to enable it unless you're going to run multiple virtual environments, which I'm unlikely to do, but I enabled it anyway. When I rebooted the host and tried to open XP mode, I got an error message. So I restarted again and reset it to "disabled." Now XP mode functions again. Do I need to uninstall Virtual PC and XP mode, then enable "virtualization technology," and then reinstall Virt PC and XP mode?