ClamWin is a Free Antivirus for Microsoft Windows 98/Me/2000/XP and 2003. ClamWin Free Antivirus comes with an easy installer and open source code. You may download and use it absolutely free of charge. It features:

* High detection rates for viruses and spyware.
* Scanning Scheduler.
* Automatic downloads of regularly updated Virus Database.
* Standalone virus scanner and right-click menu integration to Microsoft Windows Explorer.
* Addin to Microsoft Outlook to remove virus-infected attachments automatically.

What's new:

- Updated ClamAV to 0.91.1, which should improve archive and packed executable scanning as well as improve database loading times.
- Fixed duplicate database loading in certain cases

ClamWin是一套功能非常優秀的免費防毒軟件。它的體積非常嬌小，不會占用太多計算機資源，不像其它防毒軟件安裝之后會拖累整臺計算機的速度。而且除了強大的文件與電子郵件防護能力之外，它還擁有排程掃描、在線更新病毒碼、及時偵測等功能，和市面上知名防毒軟件比起來一點也不遜色！

Download: ClamWin Free Antivirus 0.91.1