No, not the system idle process. The actual system process, the kernel. This is windows 7 64-bit, core2 duo with 6gb of ram, a desktop system. At totally random intervals, the system process will suddenly start using 50% of the cpu, evenly on both cores, with no increase in ram usage. It will do this while the system is totally idle or when it's in use, it causes extreme stuttering and lag when something (ie, a game) is using the other 50% of the cpu. I've tried using a process monitor program and couldn't see anything obviously wrong. This is a brand new install of w7, so viruses and spyware are out of the question. Drivers are up to date, all windows updates applied.
I'm stumped.
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