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Windows 2003 R2 Server high System process use

What is the most likely reason for very high System process use on a Windows 2003 R2 Server. Normally it runs about 20% to 30% but the server starts to slow down and the System use shoots up to 80% to 90%.
2 Solutions
high "system" process can point to misbehaving driver, or any part of the kernel space. You can check, in general by either employing the old sysinternals 'taskmon" tool (if I remember correctly), and/or by using perfmon with monitor for interrupts. If you get them by the thousands, try to disable some of your devices, one after the other.
I would first go with the taskmon tool and sort by processor utilization... make sure you check show processes for all users... or you can just use process explorer to get more details
once you find out the process that is causing the issue you should verify that it is a valid process... a backup process with take tons of resources so you could reschedule that for a different time

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