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Thanks for your reply, David!
I already have AVG, Spybot S&D, and Ad-aware. I will scan with all of those in safe mode.
I also am trying “Windows Malicious Software Removal Tool” and “BitDefender Online scan” (the latter of which was recommended by the page in Portuguese).
The page in Portuguese also recommended something called “Combofix.” What is that, and is it useful at all in this context?
Finally, could the program “HijackThis” be used in this situation at all?