Idling at 75% cpu, Activity Monitor not showing cause

When idling with all applications closed and most excess background tasks closed my computer is showing a CPU usage of about 75% with 300 threads and about 65 processes. In Activity Monitor, however, no tasks are shown to be using a significant amount of the CPU at all. The % CPU column adds up to about five percent and the Threads column adds up to less than 65. OS tasks don't appear responsible either as they're only accounting for 3.5% of the CPU usage. Activity Monitor isn't misreporting the data, though - the computer is fairly hot and the fans are constantly running.
What could be causing the problem with my computer?

I feel a bit ridiclous, I hadn't even bothered to reselect it.
It turns out that my Folding @ Home installation was running constantly and dominating the CPU, rather than running when the computer was idle. I've uninstalled it for now, freeing the CPU again.
Thanks for the help.

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