Windows 7 Freezes/hangs After Clean Reinstall?

Ill try to make this short and simple, i had same pc for around 3 years now, finally managed to ruin my first win 7 instalation by being lazy, that resulting in long needed reinstall, no problem there,But after everything was done, my pc started randomly freezing for around 1-5 mins ( depends, usually around 3 mins ) then it just comes back alive like nothing happened, sometimes video driver crashes My first thought was that my hdd finally dying on me, but after numerous test found nothing wrong on any of them and freezes doesnt always occur on hdd usage i ruled that out, some googling blamed it on new video drivers, got other ones, same, still freezing, reseted my bios to default, still same, sometimes i can turn on a game and play 2 hours straight and nothing will happen, next time i can startup movie and it will freeze 2 times in 5 mins, already reinstalled coddecs and video players i am just running out of ideas here, never had this issue before, using same windows 7, same install, same pc and all of my drivers/programs are same ones i used