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High CPU while doing nothing. How to diagnose and fix?
I love my Windows 7 and it used to love me. But in the last few weeks, amongst the normal life changes of upgrades, installs, uninstalls, etc. etc. My Windows 7 now burns CPU frantically whilst doing "nothing".
The primary use of the CPU is the System task (PID 4) "NT Kernel & System" running at around 29% CPU utilization (or utilisation when I am in the UK.)
There is some high activity on MSMpEng.Exe (Antimalware Service Executable) 20% but no viruses have ever been found, I run MSE all the time.
Suggestions?