MAJOR computer problems

Hi, i own an Hp 7850, with windows xp, and a geforce 2mx400 graphics card...well when i start the computer, it either wants me to start in safe mode or regular, but neither one works, when i click, it it runs, and then the computer restarts, and it wont play any cds, like the " restore to an earlier date cd"....im thinking its the drivers...but im not sure, is there an easy way to fix this..i am also talkin to hp about this, but there taking a long time bout it! matt