Slow PC. High CPU Usage??

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Slow PC. High CPU Usage??

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Anyone have any thoughts on this?

PC has been getting slower over the last few weeks. The blue spinning "wait" circle (Vista) keep appearing even when I'm not doing anything and every time I click on anything. Full scans with AVG and ESET NOD32 show nothing.

I noticed from Task Manager that the CPU Usage graph is constantly cycling from 0 up to about 95% as in the picture below. The picture was grabbed while disconnected from the internet and with no known programs running.

I can post HijackThis log if required.
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Click on 'processes' and sort by CPU. That will show what is using the CPU.

If you have Vista/Windows 7 you can also open performance monitor from computer management (right click on 'my computer' then choose 'manage') to check for what is using the CPU/memory/disk.
 
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