If it's not the graphics driver, it could be another driver causing a conflict with it. And if it's not that, it could be caused by hardware failure in the graphics card. You have an NVIDIA 7-series GPU, and those are known to have an very high failure rate, unfortunately. :(
Here's some potential causes for the error you're getting:
Common issues that can cause a TDR:
- Incorrect memory timings or voltages <-- does not apply to you
- Insufficient/problematic PSU <-- most likely doesn't apply to you
- Corrupt driver install
- Overheating
- Unstable overclocks (GPU or CPU) <-- doesn't apply, unless you tried overclocking..
- Incorrect MB voltages (generally NB/SB) <-- doesn't apply to you
- Faulty graphics card
- The issue can potentially be caused by a badly written driver or piece of software, but this is an unlikely cause in most cases. <-- unlikely, as it says :P
- Driver conflicts <-- did you install a new device or driver recently that could be causing a conflict?
- Another possibility that people tend not to like to hear, is that you are simply asking too much of your graphics card. What I mean by this, is that if you have your settings too high and the graphics card struggles and falls to very low FPS, then something graphically complex occurs, it could trigger a TDR. <-- doesn't apply to you
Taken from:
http://forums.nvidia.com/index.php?showtopic=100800&hl=nvlddmkm
Another thing to check is to make sure you have all the latest Windows updates. Some of them are stability related fixes.