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As a follow-up to the question

Why can't my computer speed up again after closing large applications?

… I used Process Explorer to check my PC.

I found that there's an average 30-40% of CPU being used by Interrupt. Is that normal?

If it is not normal, could you suggest any method to check for the cause? EDIT: Although this question was tagged as an exact duplicate of another question, I found the solution on the other question is not working in Windows xp. Installation of Windows performance toolkit on my Windows xp machine doesn't work to make the command "xperf" working in command prompt. If it is possible, please help to provide some other method to find the cause.

I've execute the DPC Latency Checker and it suggest a broken driver. I checked in the Device Manager and everything seems fine. No Yellow "!" symbol. enter image description here

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Related:… – Oliver Salzburg Feb 15 '12 at 10:23
IMO, only if Interrupt equals to Deferred Procedure Call and Windows Xp equals to Windows 7/vista, this can be treat as exact duplicate. – lamwaiman1988 Feb 16 '12 at 1:30

No, that's definitely not normal. The most likely cause of such a higher interrupt level is broken hardware or a broken driver. It can also be caused by a disk being in PIO mode rather than DMA mode. Sometimes it can even be a BIOS bug.

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