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CPU sucker
I have a huge problem. I detected it when in Windows Task Manager I saw the CPU was idle, but usage was stuck at 60%! I tried new software and finally found where the problem is - it's on two processes, "Interrupts Time Placeholder" and "DPC Time Placeholder".

Usually, it sits at a CPU usage of about 20%; sometimes, it sticks at 60%. It stays at that value from power on to power off.

I don't know what to do, or, what those processes are, but they really slow down the computer!

The computer is a Athlon 1.3GHz using a Biostar M7VKA Board, version VKA0521H, running Windows XP with 576Mb RAM. Reinstalling WinXP didn't help.

Paulo

Answer:
This is something to do with ACPI interrupts happening when none should. It's fairly well known. You can fix it on some boards with a BIOS update, but the latest BIOS for your board is getting on for three years old, and may or may not make any difference. Alternatively, you can turn off ACPI in the BIOS setup and reinstall Windows.

As you say, this is a real problem; the CPU really is doing work that it shouldn't have to do, and has less time for other tasks as a result.