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One (unlikely) option: Windows XP has something called an "indexing service", that scans for file changes on your harddisks. It does this at the most annoying times, and tends to freeze some computers, or at least slow them down. As it's pretty useless unless you do huge numbers of file searches every day, you can safely turn this off (my computer, right-click on dis, properties, unselect indexing service option)
Another option would be a program that is asking 100% CPU time, when it's really really busy. I sometimes have the same thing when running Winrar or quickpar.
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