Why did Windows 7 XP Mode stopped working?

Why did Windows 7 XP Mode stopped working? Windows XP mode on Windows 7 works fine launching my legacy app, and then later on will not work with this error message:
Asked by: Guest \| Views: 362

Total answers/comments: 1

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Guest [Entry]

"I would update your BIOS on your motherboard for starters.

Second, when you do see this occur you should run this tool:

http://www.grc.com/securable.htm

and see if Virtualization really turned off, or if there are program issues."