I have this issue as well, however for me it seemed to mostly go away after I unchecked the Enable write combine option under the Trouble shooting section of the display adapter.
It still happens but very rare now, however I noticed it happen a few time mostly when I am in the screen trying to make potions for some reason. But again its not common anymore since I unchecked that option.
Windows XP - P4 1.7 512MB - GF3
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