Avast

System Requirements

Windows 95/98/NT/2000/XP

File Size 8.81 MB

avast! 4 Home Edition is a full-featured antivirus package designed exclusively for home users, non-commercial users. Both conditions should be met!

Standard resident protection
Resident protection, i.e. the real-time protection of the computer, is one of the most important parts of an antivirus program today. avast! features a powerful resident module that is able to detect the virus before it has any chance to infect your computer.

avast! Home Edition contains resident protection of the computer file system and resident module for e-mails.

The file system protection ensures that no virus will be started on the computer. It offers a wide range of settings - e.g. it is possible to specify that files will be scanned during copying, or that the scanning will include files with given set of extensions only.

E-mail protection consists of two independent modules; first, there is a generic scanner working on the SMTP/POP3/IMAP4 protocol level. It is capable of protecting any existing e-mail client that uses these protocols. Second, there is a special plugin for MS Outlook only; it is completely transparent, requiring no special settings.

New feature of version 4 is heuristic analysis of e-mail scanners. It is extremely useful in protecting against new, unknown viruses and worms that are not possible to detect by the usual means. The heuristic module performs a thorough investigation of every e-mail message and watches for suspicious signs that might announce virus presence. When the number of those signs exceeds the user-defined level, the message is considered dangerous and the user is warned.

Home Users must register it on a special avast! 4 Home Edition Free Registration page.
http://www.avast.com/eng/avast_4_home.html

Probably the Best free anti virus program on the net