I have the exact same problem on two of my computers running Vista Home Premium. This occured after the SP2 Vista update. There is a programming error in Ad Ware that need correcting. The latest program update does not addrss this flaw. I delected Ad Ware as clicking "Stop Scan" onl results in the popup window dying. The program keeps running and you cannot get out of the dead Scan window. Useless. I will stay with SpyBot until this gets some attention by LavaSoft.