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I've had that problem with two computers. The first time it was a virus. The second time was very strange. I had a warranty and I kept sending it into the manufacturer and they sent it back every time saying there was nothing wrong with it. I then put it in a computer repair shop for like 2 days and they also said they couldn't find a problem and couldn't get it to freeze. I couldn't use it for 20 minutes without it freezing. Then my HD died and replacing it didn't fix the problem. I ended up just upgrading the motherboard and CPU which finally fixed it.
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