Here's something to consider, sent from Ward Stanke. He quotes Randy B. Singer, "By far the easiest, quickest, and most complete way to remove adware from one's Macintosh is by using this free product: AdwareMedic (free) http://www.adwaremedic.com/index.php
"However, if for some reason you don't care to run Adware Medic, there is a very detailed article on how to manually remove adware, here:
http://www.thesafemac.com/arg-identification/
"Note that most of the anti-virus software companies don't consider adware to be malicious, so their products don't look for adware."
Randy B. Singer is the co-author of The Macintosh Bible (4th, 5th, and 6th editions.)