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Mysterious cpu usage

Mysterious cpu usage

A few times a day my CPU will jump to 99% usage, and it will stay there until I force a shutdown (via unplugging it). Below is a snap of the task manager during this time. I am certain a virus is not the problem. update I have found I can reproduce the problem by putting my network card under load. I have tried 3 different wireless cards (usb adapter), and it happens will every one of them.

Asked by: Guest | Views: 77
Total answers/comments: 2
Guest [Entry]

"a similar problem (high CPU usage caused by Deferred Procedure Calls) is being discussed here:

I am running Windows 7 Ultimate and my
specs are AMD Phenom 9550 Quad-Core
Processor 2.20 GHz with 6.00 GB RAM.
The computer randomly spikes up to
80%+ and usually higher than that and
the computer runs really slow. Ived
tried checking for spyware, or
anything and nothing is found. This
happens at idle and during normal
activity. Restarting usually solves
the issue but sometimes it doesnt.

what seems to have solved the issue was this hotfix:

You encounter problems when you move data over USB from a Windows 7 or Windows Server 2008 R2-based computer that has an NVIDIA USB EHCI chipset and at least 4GB of RAM

Thanks alot! The hotfix did the job. I
was so tired of 100% Usage... thats
fixed now.

so, if your computer has an ""NVIDIA USB Enhanced Host Controller Interface (EHCI) chipset"" and ""at least 4GB of RAM"" and ""you try to copy data from the computer to an external USB storage device"" (i suppose, using a USB WLAN adapter qualifies for that too), then this might be the solution."
Guest [Entry]

"Some ""top of my head"" culprits might be:

""scheduled"" (by W7, not you) fragmentation
Indexing
Like you mentioned, old or missing drivers. W7 is good at putting drivers in Windows Update > Optional Updates. If not I would get them from the manf website, starting with BIOS, Chipset, System Interface, and Video. Then go down the list from there."