Hi thanks for taking the time to read my post I recently installed a 9800 gt and vista, everything was nice for a while, then i got my first crash while playing a game. "Nvlddmkm.dll has stopped responding and has successfully recovered" error message popped up. These got more and more frequent so I decided to look around and found this was quite a common problem so i tried all known workarounds but nothing worked (including reverting back to XP). I decided to try and take the GPU back and swapped it for another 9800 gt an inno3d version this time, put it into my abit fatal1ty an9-32x and was perfectly happy for around 30 minutes, then all of a sudden my pc cut out whilst in the middle of a game. I tried to power it back up but was greeted by a blank screen so I cant get to bios or anything. Post code on mobo halts 9.0 sometimes but other times when i boot up i get C 1. Have tried clearing the cmos with the jumper, taking battery and all power connectors out and replacing it all then booting up again but nothing. Also tried taking out the new GPU and it doesnt halt at 9.0 or C 1 when i boot up without it. Haven't got a spare to test with yet. Im running with Vista 32 bit A-Bit fatal1ty an9-32x OCZ DDR2 Nvidia SLi ready memory Processor is AMD AM2 socket no idea of model number sorry 580w hiper PSU TYPE M (HPU-4M580) Any help would be greatly appreciated. P.S have had no previous problems with this setup when using my old 9500 gt, but haven't got it at the moment to test with.