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

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