ANSWERS: 1
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most likely a piece of malware has disabled it as it prevents you from using the search to find infected files. i reccomend downloading spybot s&d http://www.safer-networking.org/en/download/index.html and doing a full scan, this may fix it but on some occasions copying the contents of C:WINDOWSpchealthhelpctr from another pc may help once the adware is removed otherwise it will just disable it again. if neither of these work you may need to re-install windows and do a repair
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