Windows shuts down showing "Generic Host" applet popping up and shuts within 60 seconds unresponsive to any request. This has occurred 3-5 times in last 2 years and I have to reinstall windows/format disk. Tried restoring yet works for a bit of time yet never helps.
I suggest that you first run your antivirus application or antimalware (such as the free tool available at http://www.microsoft.com/security/mal...) in safe mode to see if there are any related issues.
I ran into a similar issue with an old HP scanner driver on Windows XP - please see Microsoft KB 821690, Generic Host Process Error Message and a Flashlight Icon Appear, for more info (http://support.microsoft.com/kb/821690)