Moved to Malware Discussion > Home User Assistance.
There is an excellent removal guide here: http://www.bleepingcomputer.com/virus-removal/remove-win-7-internet-security-201 1
Scroll down that page as the first links are advertising.
Its a kind of sypware activity, kindly follow the steps to remove it.
Go to safe mode or safe mode with networking to stop the process of spyware activity
Take the backup of whole registry to avoid any serious problems
Go to start>Run> type folder options>enable hidden files
Then go to the following location
c:\documents and settings\%user profile%\Application data\<random 3 letters>.exe
Vista or Win 7:
c:\users\%user profile%\AppData\Local\<random 3 letters>.exe
Deleted the above mentioned file
Then go to registry
NOte: If you problems in going to registry, Go to Start Menu>Run>type Command to get command prompt
Then type registry.exe in the command windows which will prompt you that
HKEY_CURRENT_USER\Software\Classes\.exe "(Default)" = 'secfile'
HKEY_CURRENT_USER\Software\Classes\.exe "(Default)" = 'exefile'
HKEY_CLASSES_ROOT\exefile\shell\open\command "(Default)" = "%UserProfile%\Local Settings\Application Data\<random 3 letters>.exe
HKEY_CLASSES_ROOT\exefile\shell\open\command "(Default)" = "%1" %*
Restart the computer to the normal mode
Then the issue must be fixed