My first guess would be some program running in the background possibly hogging some resources. Does it happen as you load something, or can you just let the computer sit idle and still have the problem...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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