I don't know how many fucking times I've had that!! Pisses me right off, but usually It only does it the once, then disappears and you don't have any more hassles.
Run the virus scan at:
http://housecall.antivirus.com/housecall/start_pcc.asp
It should detect the prog. & either autoremove it or give you instructions how to do it manually.
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I Botox my ballbag.