If several system processes seem to freeze, while CPU and Memory usage remain low, does this suggest hard drive failure?
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Probably not. Other symptoms would likely creep up before system processes freeze, and if this is your only symptom it could be indicative of many different problems.
But it can't hurt to make sure. Run a chkdsk at the command prompt and any HDD testing included in your system. While these tests won't 100% prove that your HDD is fine, it's a quick and easy way to convince yourself to start looking elsewhere for the problem.
Try running sfc /scannow at the command prompt to check the integrity of Windows. (Note that this test isn't 'all inclusive' either.)