Posted 24 March 2011 - 08:35 PM
"In February 2010, a rogue security software package calling itself "Security Essentials 2010" appeared on the Internet. This malware, designated TrojanDownloader:Win32/Fakeinit, bears no resemblance to Microsoft Security Essentials except for the name. This malware reappeared again in November 2010, this time calling itself "Microsoft Security Essentials 2011".
The rogue software features a persistent pop-up and prevents access to any sites on a browser address bar. There is a fix listed in bleepingcomputer.com.