I had a similar problem just recently at work with Win 2000 Pro. It began just after I downloaded and installed the cumulative patches supplied via windows update. The application taking up all the resources was svchost.exe, not to be confused with scvhost.exe, which is a virus. I found this out by simply opening the task manager and looking at the processes running (as has been suggested in previous posts). Once I uninstalled the "hotfixes" (as M$ calls them) the problem corrected itself and saved me a big headace of reinstalling windows...which is another option. I don't know if this same issue applies to win XP, but if you have recently installed any updates, other then SP1, I would look carefuly at this possibility.
Hope this helps.
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Sigma Zeta 314
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