CPU usage stuck at 50% and above when idling

I've been using RMclock to undervolt recently and all was fine. Now a few days later my CPU usage is always at 50% or above when nothings going on. At first I thought is was spyware. So I ran spybot S&D and adaware and found nothing. I tired shutting down some programs as well as RMclock, and still my CPU usage is at 50% and over. What could be causing this?

 

Ctrl-Alt-Esc and click processes to look at what's using your your cpu.

 

In the task manager its my system idle thats killing my CPU. What could this mean?

 

No system idle accounts for the 50 percent you aren't
see-ing, I.e my cpu usage at the moment is 5%, system idle is 95% ie. "system idle" is merely a statement saying the computer isn't doing anything, this much of the time.

There must be something else in your processes list that is accounting for the 50%

 

Maybe you are not looking at all processes? Under Vista you may need to use UAC to authorize seeing all processes.

In my experience I have seen explorer.exe take a lot of CPU under Vista sometimes when it feels it needs to reindex some folders. A quick workaround is kill explorer.exe (I think you will lose open folders and window controls) and then re-launch it from "New Task..." of the "Applications" tab of process manager.

 

cool........