Thank you very much for this post. I had a very similar problem and used your instructions to identify the problem.
In my case, Win7 automatically updated a driver for an I/O card and there were conflicts with the IRQ's. I had suspected the driver update as it occurred about the same time that I noticed the high (30%) CPU usage. But I had no idea how to check or confirm until reading your post.
How to get the cause of high CPU usage by DPC / Interrupt
in Windows Tips 'n' Tweaks
Posted
MagicAndre:
Thank you very much for this post. I had a very similar problem and used your instructions to identify the problem.
In my case, Win7 automatically updated a driver for an I/O card and there were conflicts with the IRQ's. I had suspected the driver update as it occurred about the same time that I noticed the high (30%) CPU usage. But I had no idea how to check or confirm until reading your post.
Vielen Dank!
Tim