Quote Originally Posted by cash_site
Hmm... when you installed the Nvidia card, did you install new drivers too?
Yes!

Quote Originally Posted by cash_site
To check memory, use MemTest...
Ok thanks!

Quote Originally Posted by cash_site
Else, try reinstalling your AGP Chipset driver, and Ati or Nvidia drivers...
I tried to reinstall any driver a couple of times.

Quote Originally Posted by cash_site
Did you make any tweaks to windows? I remember there being an issue with Ati cards and Lots of memory, and setting the LargeMemory tweak? Just a thought.
I didn't make any tweaks to my windows! What do you mean with setting the LargeMemory tweak?