Does it really identify itself as "Mcaffee AV"? Or is it McAfee? Either way it's probably malware/spyware, since you can't "accidentally" install most legitimate software, anti-virus software included. <S>
McAfee Security Scans come with most Adobe products now days. There's a possibility downloading Adobe Reader got you that software.
That really should be illegal.
AAargh. I didn't realize that. Adobe is already just about my least favorite software company - it sounds like they've upped the ante from toolbar and cloud based backup solutions....<S>