Does this pop out more often? I have few sugestions,
1. Like isam said try to install the latest driver updates for your graphic card.
2. Try increasing the GPU time out
3. Try one of those cooling pads to help cool your laptop, the GPU maybe over heating.
4. Try re installing windows 7 with the latest drivers.
If non of them works and the error pops out more often there might be a hardware issue with your GPU