CPU Usage high when USB eneabled

I have a PC running Windows XP with a MS6340 (V5) motherboard and Athlon XP 1800 processor.
When getting a poor response I noticed that the performance tab on Task manager showed that CPU usage was wildly fluctuating between 50-60%. This was farily soon after booting up and nothing else was running. The Processes tab on task manager showed that there were no processes running which got anywhere near accounting for this.
I downloaded a program called Iarsn TaskInfo2002 which shows that the CPU Usage was because of something called Interrupts Time placeholder and (to a lesser extent) DPC Time Placeholder.
Anyway the interesting thing is that by disabling my USB ports (via device manager) and then rebooting the problem was gone. (Interrupts Time and DPC Placeholders don't clock anything.)
Now, however, I have a USB camera and Printer and so MUST get my USB ports enabled again.
I can enable them after booting and then the problem is not as bad, but I nearly always forget to disable them again before shutting down and then next time its a pain.
Is this likely to be
A motherboard problem,
BIOS problem
Windows XP problem
or me being stupid.
Any (polite) advice would be gratefuilly received
SIDDY

Hi,
It's not a motherboard problem.
As the board only provides the ports, nothing more.
The program that queries the ports for data is most likely the problem.
Try deinstalling the printer or camera software, see what happens.

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Apologies the rich text editor is not working and i am unabel to format this code properly
Rows Operation
______0 NESTED LOOPS (cr=117469550 pr=444 pw=0 time=1670966102 us)
(snip)
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(snip)
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