Windows Security 2011 is a fake antivirus program that try to trick the user to buy the full version of Windows Security 2011 by using fake scan results. Windows Security 2011 installs itself into the computer without confirmation of the user unless the user set the UAC level to the highest level. Windows Security 2011 start itself when the computer boot and scan the computer automatically and produce fake scan result and keep on warning the users to buy the full version of Windows Security 2011. Windows Security 2011 is delivered via criminal websites and trojan infections. Windows Security 2011 cannot detect and remove any malware, trojan or virus.

Windows Security 2011 can be removed by using Emsisoft HiJackFree (http://freeofvirus.blogspot.co.nz/2010/ ... kfree.html ) by stopping the process (Windows Security 2011.exe) and delete the files at the same time. Then, remove the autorun setting set by Windows Security 2011.

Windows Security 2011 should be removed immediately.

Windows Security 2011 Removal Guide
Kill Process
Uninstall.exe
Windows Security 2011.exe

Delete Registry
HKEY_CURRENT_USER\Software\Windows Security 2011
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "Windows Security 2011"
HKEY_LOCAL_MACHINE\SOFTWARE\Windows Security 2011
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Windows Security 2011

Remove Folders and Files
locate the files from the autorun settings and delete all of them
Uninstall.exe
Windows Security 2011.exe
%UserProfile%\Desktop\Windows Security 2011.lnk
%UserProfile%\Start Menu\Programs\Windows Security 2011.lnk