sounds like something very nefarious has happened here...
do you have a system restore point set? if so, use it to see if that solves your problem...
if that doesn't then ask yourself the following: how long are you prepared to try and ferret this out and how long will it take you to do a clean install of your OS....I usually choose the clean install route as that guarantees success....
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So Long and Thanks for All the Files
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