System Security 2011 harms computer system. This is partially a side-effect of the adware activities, but also a plan of the hackers. For instance, the adware misadjusts DNS settings of favorite browser on captured machine. This modification causes inability of user to visit pretty harmless sites as the adware would block these pages declaring maliciousness detected. Such prank has its explanation in the alert generated by adware. The alert would dump it all on imaginary viral code allegedly detected by the scanner that does not exist in the actuality.
Remove System Security 2011 to prevent further damage to your computer system and watch no more the fraud expressed in its alerts and nag screens. System Security 2011 removal tool available here is a free scanner that would detect malicious objects integrated into your machine and invite you to remove the adware in question and real viruses detected in the scanned memory.