My laptop turns itself of after 8 minutes - every... My laptop turns itself of after 8 minutes -

Question

My laptop turns itself of after 8 minutes - every time i turn my laptop on it lasts for about 8 minutes then turns itself off automatically how do i stop this?I am trying to find drivers for my laptop its a lavie NEC company, Model PC-LL5503D1Y. I lost my cd for the drivers and im finding all sorts of problems including crashing, not able to use my web cam or any usb port due to lack of drivers please help me.....Laptop overheats while playing games and area above RAM seems to get very hot.