It could be numerous things from paging file size set up incorrectly to webbots. Do you have an IT person at work? 4 CPU's in 5 years tells me that someone isn't doing their job correctly. I've built my own PC's for over 10 years now and the only thing I've ever had to replace has been a few hard drives once they've started making noise. Of course, I don't overclock my video cards.
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