avast! antivirus software provides complete virus protection for your computer. antivirus engine is complemented by anti-spyware, firewall and antispam modules to protect you against phishing schemes, identity theft and internet-distributed web viruses. Automatic updates for greater user convenience and safety. Top user ratings among free antivirus software. The new avast! Free antivirus 5.0 includes a spyware detection engine. To protect you from identity theft as well as viruses
Works on Microsoft Windows 2000, Microsoft Windows XP/Vista/7 (32/64 bit).

avast! provides a package of applications that aim to protect your computer from a possible virus infection or other malware threat. If you use it correctly, and in combination with other programs such as data backup utilities, it will significantly reduce the risk of your computer being attacked or infected by a virus, and thus the risk of losing important or private data.
The avast! Internet Security application comes with an antispam filter and built-in firewall. Once installed, avast! runs silently in the background to protect your computer against all known forms of malware

Changes in Version 6.0.1367:
- Script Shield now works with Google Chrome, all versions of Firefox and Acrobat Reader
- Improvements in WebRep plugins (especially IE)
- Stability improvements in aswSP.sys and the avast! sandbox
- File system shield: improved on-close scanning
- avast! Internet Security: new antispam engine
- Web Shield and Script Shield: more options in the UI
- Added in-product avast! Market
- Various other security and stability related fixes