hi there to all
i have recently installed Window 7 few days before. it is working excellantly but after continuous work of 1-2 hrs it shut downs automatically.
helps me to solve the problem
thanking you all
Agree with moricon, sounds like you've got the beta installed. Check the build number (it should show on the desktop). If it's Build 7000, then it will shut down by itself after 2 hours.
Try and get hold of the RC or RTM builds (7100 or 7600). They will keep working for few months yet.