Same Problem
Anyone ever get anywhere on this problem? I have the exact same thing happening only I am running Vista Ultimate and have a MSI K9N SLI Platinum motherboard. I found my computer sluggish and then noticed the system process using 100% of my cpu. Upon further investigation using xperf, I traced the problem to about 5 kernel worker threads using about 20% of my cpu resources each. Didn't really know where to go from there so I tried disabling some things in the bios. Disabled just the usb 2.0 controller and viola! no more insane cpu usage. I am thinking maybe one of the usb driver .sys files may be corrupted but am no sure. I would appreciate any help.