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system process using constantly 20% cpu - win7 pro 64 [migrated]

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http://serverfault.com – In my win7 professional 64bit I see the system process using 20% of cpu constantly. This also tends to rise the cpu temperature, causing the fan to start, and in general slowing down the entire system. The pc is a HP laptop, with 4GB of ram. Using Process Explorer, double clicking the system process, I see that the most cpu consuming threads are from ntoskrnl.exe, as in the image below. I tried a memory check, and also some hints found in the net, no results. The question is: what can I try to find a solution? I need a direction... Thanks a lot Andrea (HowTos)