Internet Security 2011

According to S!Ri (Merci pour la sample)
Internet Security 2011 is a fake security tool (rogue)
Internet Security 2011 prevent softwares execution (task manager, processXP, GMER etc.) and display a lot of disturbing messages to scare users.

If your PC is infected with Internet Security 2011, close the rogue by doing this:

Then, use MBAM to remove the infection.
if you have some problem with this, follow the bleepingcomputer guide