Fardarkside,
First things first...you gotta start with the obvious!
1. Make sure you are using the latest Nvidia driver for your video card - They have made some progress with that TDR BSOD
2. Blow out the internals of your system, especially the video card sink and fan and
verify the video card fan is working
3. See if the problem persists...if it does, I have a registry tweak you can try.
OH, and while you are in the machine, inspect
motherboard and video card for bad capacitors! Go to:
Badcaps.net - Badcaps Home look at the images on the right so you know what you are looking for.
**Thanks to Wrench97 for that link!