Vista Security 2011 is one of the rogue applications/malware. Try running several malware scanners. It is best to run several as each will pick up things that the others miss. Some scanners you can try are: * Malwarebytes - http://www.malwarebytes.org/mbam.php * SuperAntiSpyware - http://www.superantispyware.com * Ad-Aware - http://www.lavasoft.com/products/ad_aware_free.php * Windows Defender - http://www.microsoft.com/windows/products/winfamily/defender/default.mspx * Spybot S&D - http://www.safer-networking.org/en/home/index.html The following link may also be of use, it shows that Malwarbytes should be able to remove it - http://www.precisesecurity.com/rogue/vista-security-2011 If the above malware scanners do not find any malware or can not clear it, you should consider posting in one of these forums for specialized malware removal help: * http://forums.spybot.info * http://www.spywarewarrior.com/index.php * http://forum.aumha.org * http://www.bleepingcomputer.com/forums * http://www.spywareinfoforum.com