scareware
n.β Β«Researchers are also warning of new forms of scareware that are coming up on paid search results. Scareware is a term for fake antivirus software sites that appear to come from well-known vendors such as Microsoft.Β» ββSpammers Are Gaming Googleβs Adwords” by Richard Adhikari InternetNews Jan. 22, 2009. (source: Double-Tongued Dictionary)