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From: Lorne on 8 Jul 2010 06:38
If anybody else has this problem the procedure to find a solution is here:
http://www.msfn.org/board/topic/140263-how-to-get-the-cause-of-high-cpu-usage-by-dpc-interrupt/

It requires some reasonable understanding of computers to follow it however.
In my case it was a driver called nmserial.sys that was hogging the cpu.

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"Lorne" <lorne_anderson(a)hotmail.com> wrote in message
news:eAFlOUPHLHA.4596(a)TK2MSFTNGP06.phx.gbl...
> I have Windows 7 home premium running on an AMD X6-1055 6 core processor.
> If I start Windows and leave it doing nothing except the background
> processes loaded at boot time the CPU runs continuously at 14/15%.
>
> When I inspect task manager it tells me system idle process is 99%, and
> none of the 80 running processes register above 0%, but at the bottom CPU
> use is still 14%+.
>
> When I look at the performance tab one processor (always the same one) is
> running at 85-90% and the others near zero.
>
> When I use a motherboard utility it shows the same thing - one processor
> at 85%+ and the others near zero.
>
> How do I find out what is running to cause this when task manager does not
> show the process? I have run Malwarebytes - it shows nothing unpleasant
> on the computer.

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