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I have a HP Probook 4520s with Windows 7 Ultimate, i5 Processor and 2 GB RAM.

For the last couple of days, when I turn on my laptop, the CPU usage rises up to 100% and remains there for 10-15 minutes. No offending process shows up in Task Manager/Process Explorer but the laptop is practically unusable for that time. This has been happening for 2-3 months.

What can I do now?

I don't have any Apple application. I just use the common applications.

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Did you click the "show all processes" button? How about in the resource monitor (can be opened from the performance tab) –  soandos Jun 17 '12 at 6:49

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