i have this same problem with a dell laptop (inspiron 5100) except that instead of hitting 100% every 20 seconds and then going down, it seems to start being less and less efficient as time goes on. if you close a particular program and then start it again, it's fine, but i can't even for example play a flash game (with the sound off and quality on low) for more than 5 minutes without it freezing up on every single frame.
it's actually a fairly recent problem for me, i was thinking about reinstalling windows and seeing if that fixed it. it's interesting that we're having such similar problems with such similar hardware, though.
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