In a world of high-priced subscription antivirus programs that bog down your PC while protecting it, Avast stands out. This program is one of the few free antivirus applications that do as good a job as any of the big boys. Avast includes more than seven different kinds of shields, safe-surfing tools, and real-time virus protection for your OS, as well as Outlook. Updates automatically download and install, and Avast works with both Windows Vista and XP. Given all this, why pay?
It has:-
1) Instant Messaging shield
2) eMail Shield
3) Network shield
4) Outlook Shield
5) P2P shield
6) Regular Shield
7) Web Shield