Display Stopped Responding


I have Windows 7 Home Premium on a machine with a Radeon 6790. Now all the time I keep getting a black screen and then after a few seconds the screen returns with a message in the bottom right corner saying my display has stopped responding but has recovered. This happens so often it is annoying. It only happens when doing 2d. Never while playing games.

Does anyone have any ideas how to solve this?
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