Tabassum, I think you should make sure your BIOS is updated to the latest version, make sure nothing is being overclocked, install Windows 7 64-bit, and make sure that your computer is getting properly cooled physically, as computers will sometimes restart "randomly" if they're overheating. Good luck
dude, you are looking for "restore BIOS to default settings", just look for it under maintenance or else, you will find it, hit yes,confirm. Done As it was said earlier, you need to fresh install win 7 64its