Variety of protection shields:-
– Mail Shield for preventing malware in all incoming/outgoing e-mails including SSL communication.
-Stable and improved Web Shield against infected web pages, files, pages and java scripts downloaded from the internet.
– IM Shield against malicious files downloaded while using chat applications.
– Network Shield for protection against network-based viruses.
– Improved Behavior Shields which monitors the Operating System file system, registry hives for any suspicious behavior.
Faster:-
– Scanner remembers the safe files and thereby reduces the re-scans required for same file unless the file is modified.
– Faster application of antivirus updates
-Â Multi-threaded scanning promises accelerated scans.
Other features:-
– Very professional and simple Antivirus control User Interface.
– Silent Mode which detects full-screen applications like games and disables the annoying pop-ups and other on-screen notifications without degrading security.
– Improved real time anti-rootkit protection (Rootkit means a software which enjoys continued privileged access to a computer while actively hiding its presence from administrators).
– Boot-time scanner (64 bit support as well) which allows scans even before the operating system has started and before a virus can be activated
Well, quite impressive… Avast! also has paid versions of the antivirus software which includes features like Silent Firewall, Anti-spam, avast! Sandbox, command line scanner. Watch out this space  for more on the paid versions of Avast.
Download Avast! 5.1 Free Antivirus Here