Ive had a problem with Nvidia drivers. On my computer, I had a Nvidia GeForce 9400 card and had recently gotten updated driver for it, and thats when my problems began. It would at random cause my computer to shut down. I tried uninstalling driver and putting it back in I tried resetting the card I tried temperature scanning software to see if it was overheating, etc. I checked all fans, and made sure the inside was clean etc. nothing. problem still happened.
Well I have a new computer and AMD ANthlon 2.6 dual core and I just put in a Nvidia geforce 9800 GT cause it runs my games well and is affordable. Made sure to have current drives and tah dah same thing is happening on my perfect NEW computer...
I agree, I would strongly suggest first uninsatlling any old drivers. After removing the old drivers, shutdown,install the new card. Then install the new drivers, even if you go NVIDIA to NVIDIA, drivers don't tend to work, unless you use the ones that come with card. Give that a try.