Norton 2011 OEM: Download Norton Antivirus 2011, Norton Internet Security 2011(NIS 2011) and Norton 360 v4 for free with 90 days trial subscription instead of the default 14-day trial. Simply download and install, no product key is required.
Norton Antivirus 2011 is very lighter in load with Powerful Insight Protection, a unique feature from Symantec for 2011 Norton security Suites.
Norton Antivirus 2011 provides 3 levels of protection.
-Based on Virus Definitions
-SONAR Protection(Symantec Online Network for Advanced Response) which is basically a heuristics detections
-Norton Insight Network Protection