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Is this something recent? If so run a System Restore to a time before it started.
Do you use LogicTech SetPoint? If so a recent Windows Update clashes with it.
Now that you have added the sound problem, and malware is not the problem, you may want to consider a Repair Install.
http://www.sevenforums.com/tutorials/3413-repair-install.html
It should not affect your personal data or installed programs, but a backup up first is always a good idea.