CPU maxed recently

I have 2 Windows 2000 Pro PCs that are experiencing maxed out CPU in the past week. My PC would max out every time the antivirus tried to do an update. The 2nd PC maxes out and basically locks up when defrag is started. I did some Windows Update installs in the past week on both, and since that is the only change that I’m aware of, I’m suspecting one or more of those updates.

Has anyone else seen this recently?