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I run Windows 7 Ultimate (32), on a Dell Latitude E6500.

After a while the CPU usage suddenly raises to 100% and only reset will help. Taskmanager does not show any program with a high CPU usage (only taskmanager itself).

  • I disabled all non-windows services, without effect.
  • I disabled Avast Free without effect.

The strange thing is that I have this problem frequently, but only when I am connected to the internet with the ethernet cable at work. At home, with a wireless LAN, I never have this problem.

I use either Firefox of IE, but that does not make any difference. Does anybody have a clue and/or a way to identify the cause of this?

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1  
Did you click show all processes? – soandos Jul 12 '12 at 13:40
    
Try booting in safe mode and see if you still have the same problem. – user142485 Jul 12 '12 at 13:41
2  
Start -> Run -> resmon.exe – Breakthrough Jul 12 '12 at 13:52

Run Resource Monitor. That will show you what's using the CPU.

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