Problem: Restart the computer to play the movie in high resolution. its a common problem in many computer. Follow below solving method carefully
Solve Method:
1. Install all driver from mother board CD
2. Update Graphics driver.
3.
Use any Updated Codec pack.
4. Use Classic Media player for play your Movie.
5. Check CPU internal Temp. and cooling system.
6. Check the control panel/admintools/event viewer for errors that show up
just after the last unexpected off. if its error 41 or error 124 then is
most likely a CPU issue.
If the problem is still not solved the First restart the computer and press F8 till you get the Advanced Boot menu (Safe Mode etc) If it's listed Disable Automatic Restart after Error