Update to let you know what it was.
Last week I was on holidays and while I was gone one of the techs came buy and removed my dev card from the chassis and repaced it with the new version. Which was a nice thing because I had been waiting for the new version. But he did not tell me that he had done it, and he had not bothered to re-load the code running on the card.
I used Eezy's suggestion and used Process Explorer. It pointed to the hardware interrupt thrashing like crazy.
Once I uninstalled the card the CPU settled down all nice and quiet.
Thanks for the help all.
Hoping someone might have seen this before.
I have a chassis here at work that has 2 AMD dual Core processors on it. I am running XP Pro with a minimal software load. Basically the machine has a base windows XP install and out software.
This morning I re-booted and I noticed the machine was acting sluggishly... I did a quick check and one of the CPUs was spiked at 100%. This is fresh from re-boot with no software actively running.
While Task Manger shows the CPU spike it shows no task consuming any CPU and no tasks running that should not be running.
I have run virus scans and spy ware scans. The only change to the machine was a security patch to windows for Windows Media Player.
As an additional note when I booted into Safe Mode, the CPU was not spiked.
Has anyone seen anything similar?