Computer Help Please!

[goldustsongbird]

Sounds more like spyware not a virus, so I'm not sure if McAfee would even pick it up. Try these out: http://www.safer-networking.org/
http://www.malwarebytes.org/mbam-download.php

McAfee sucks imo, so if you want better ~protection~ (sorry, I'm sounding a lot like a commercial here.. ), I'd go with either avast or eset.
http://www.avast.com/eng/download-avast-home.html
http://www.eset.com/

Hope this works