Some more info would be helpful, like what OS you have, more examples of when the freezing occurs, how long the freezes last, if you've recently added any hardware or software, etc.
I can think of a few possibilities off-hand; memory problems (insuffient, bad, mismatched, memory dump), overheating, or a conflict of some sort (could be hardware or software).
dlh6213
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AND the most important ... defragment your system drive. That will give windows a relief.
nanosani
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