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#21
When you run process explorer do you see the CPU spending time in DPCs and Interrupts and the CPU having a steady ~30% usage ?
It could be your iPhone or some other USB device. I discovered yesterday that my iPhone was triggering this. The system is at near 0% CPU when idle but after I connect my iphone it jumps to 30% and stays there (doin somethin with DPCs and Interrupts) long after the iphone is gone. But after a reboot or a sleep, the system goes back to normal ~0% idle cpu usage.
I believe MSFT has posted some patch/fix for similar problems with USB drives but I am too scared to try it out.