Facebook isn’t letting me log in and is telling me I have a virus!. Random words on web sites are underlined and cause pop-up ads when I put the mouse over them!. When I try to visit a web site, I get redirected to a different site!. Someone is sending messages from my e-mail address!. My computer is crashing/slow/doing something weird!. If a good anti-virus scanner doesn’t turn up anything, you’re probably not infected with anything, and your problems lie elsewhere. If, after reading this, you have reason to believe that you do have malware on your computer, use a scanner recommended in Do I need anti-virus software?. Browse through the descriptions of symptoms, and when you find one that matches, your answer will follow. If you think you have malware, you probably have some kind of reason for thinking that. 
Note that it is written on the assumption that you have read the Macintosh Malware Guide first. This FAQ, which is part of my Macintosh Malware Guide, will help you determine whether or not you should be worried. I hear this question all the time these days, and find myself often typing the same things over and over again.
June 17th, 2012 at 9:29 PM EDT, modified
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