Most likely this is either a bad video card or corrupted video drivers. The first thing to do is to download a copy of the latest certified drivers for your video card from the video card chipset manufacturer's website (ATI, nVidia, etc).
Then the video drivers from Control Panel...Add/Remove Programs (if they're not there, don't worry about it) - and removing the video card from Device Manager.
Dismiss the Found New Hardware Wizard and double click on the freshly downloaded drivers to install them. Reboot as required.
For further troubleshooting, you may want to read this post about finding BSOD messages (as I suspect that's what you're having) http://www.bleepingcomputer.com/forums/top...tml#entry409491
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