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On my Windows 7 laptop I have the free software: Avast (for anti-virus) and Super Anti-Spyware (for anti-spyware). They seem to do a pretty good job at preventing this sort of thing in the first place, and if you don't already have anti-virus/anti-spyware software, installing these and doing a scan might find and fix this exact issue for you. Just be sure to download them from reputable sources like: source forge, or cnet.
And if you already have anti-virus/anti-spyware software, installing multiple ones can cause problems as they don't tend to play nicely with each other.
I usually go through the google results, and look for a solution that does not look too wacky or involved, and does not tend to use additional software that no one has ever head of. The genuine solutions will be the ones that several people say work, from several different web-sites.
Good luck.
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