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View Thread: Process 'SYSTEM' Run By 'SYSTEM' Using 100% CPU
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    anthq11 wrote:
    Is there any causes of System (not System Idle Process) running at 90-100 for extended periods of time?

    Most likely it's a buggy driver.  USB devices are particularly notorious for having drivers with a high CPU load.

    I suggest that you shut off or remove devices one at a time until you find the culprit.  Start with USB devices.