Help!  
Somehow I have become the proud recipient of an irritating ad located in the lower left side of my display.  It says that I have been infected by a virus and if I click on the ad they will tell me how to get rid of it.  It takes me to a web site for Spyfalcon, a spyware removal software company.  I don't want their software, but you must buy to eliminate the ad.  I have ZoneAlarmAV, Spybot, Spysweeper, AdAware SE, MS Defender(beta), Registry Mechanic, The Cleaner, and RegCleaner. None of these have touched this irritating little piece of malevalence.  Please help!

Harold Thomas

               The NOSPIN Group Promotions is now offering
                 our special coffee mugs and mouse pads
              with the PCBUILD logo...  at a great price!!!
             http://freepctech.com/goodies/promotions.shtml