Windows XP on my Core 2 Duo laptop started having idle CPU usage of about 80%. Rebooting doesn't help but in the safe mode everything seems normal. I've searched the net and there are a lot of people with similar problems but the solutions they have found don't seem to help me. Most of the people having this kind of problems are playing games or using P2P software but I don't and my computer is optimized for music.
The usual suspects eliminated:
My hard drives are in DMA mode, none of them has changed to PIO mode.
I can't find any kind of hardware failure but it's a laptop so I can't be certain.
Disabling network doesn't help.
I'm pretty sure it isn't a virus or spyware.
In Task Manager the CPU hogs seem to be "System" and "explorer.exe" processes but pretty much every process seem to be overly active. My guess is that something is jammed and the operating system constantly calling for the jammed thing causes the CPU usage. I've tried reinstalling and disabling different parts but nothing helps.
I've downloaded Process Explorer but I haven't really gotten the hang of it. Any ideas?