Hi,

So for the BIOS, should i upgrade to the Windows 8.1 64 bit?

GPU - Yes it's exactly the same slot.

Thank you for responding.

I had a nvidia video card and switched it to an ATI...i had the BSOD so i switched it back to the nvidia but the crashes kept happening, so i went back to the more...

As per my title, numerous BSODs, various crash error codes. And i can't leave my computer alone for 20 minutes or else it crashes. It also crashes at random intervals as well.

Please see zip file...