CPU usage very high, performance low

Using activity monitor, I gauge my cpu usage to be between 50 and 60 percent, with the Activity Monitor being THE ONLY APPLICATION OPEN! There are only two events which I can remotely correlate to this problem: downloading and using a new version of Firefox (3.07) and downloading and using Amadeus so I could listen to a Wiki file.
When I open Firefox or any other application, CPU usage goes straight to 100%. Then the machine slows down significantly. Any ideas?

You guys are not going to believe this! I did some searching where I discovered this comment by a user on MacRumors (sp?) named "cyantist:"
"For some reason I remember having this issue a while back, and the solution was this: right-click on the desktop > show view options > deselect show item info. It worked for me, but it wasn't Finder that was giving me 100% cpu, it was Safari or Camino."
Well, I couldn't really figure out what he had done but I right-clicked on the desktop>More>Configure Folder Actions> disable Folder Actions. Voila! Finder and mds dropped off the Activity Monitor list with percentages less than 1. Yikes! I did some experimentation and it turns out that all one has to do IS RIGHT-CLICK ON THE DESKTOP! At first, I thought it was toggling every time I selected and deselected "Enable Folder Actions," but doggone if the Finder and mds didn't drop off the map by simply right-clicking on the desktop. Bizarre! Now, with Activity Monitor and Firefox open, the cpu is running between 10% and 20%. Go figure! I'm not going to mark this problem as solved until someone chimes in with a reasonable explanation (which might come from . . . The Twilight Zone . . . )

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