Graphic card error, GeForce GTX 460?

I have a problem with my graphic card drivers. I have GeForce GTX 460 with 306.97 drivers installed. Every once in a while my screen in going black for about 10 seconds and then I have a tray bubble with information that my driver turned off and restarted again. Do you know what is going on and what can I do... show more I have a problem with my graphic card drivers.
I have GeForce GTX 460 with 306.97 drivers installed.
Every once in a while my screen in going black for about 10 seconds and then I have a tray bubble with information that my driver turned off and restarted again.

Do you know what is going on and what can I do about it?
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