A couple of the messages on
***this page*** say it can be a RAM issue rather than a video card issue (posts #10 and #11), but unless you just changed or added RAM to the computer, I don't think this is likely.
According to Post #3 on
***this site*** it is a very common problem and there is no solution.
Post #12 on
***the second page of that thread*** says they got rid of the problem by going back to old drivers.
Post #17 suggests changing the RAM timings and disabled "Intel C-State Tech" in the BIOS.
Post #18 suggests the cause might be related to temperatures. If that's the case, your computer might just need the dust cleaned out.
So as you see there are several problems that could cause the same symptom, and for some of the problems there is no fix. But you won't know that unless you try all the fixes.