【求助】win2kServer and Nav2001電子郵件防毒

今天收到一封E-mail:
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ScanMail has blocked a file during a real-time scan of the email traffic.

Date: 8/29/2002 19:28:24
Subject: A very funny game
From: xxx <[email protected]> <-- [我的E-mail]
To: xxx <[email protected]> <-- [此帳號不在我的通訊錄內]

File: setup.exe
Action: delete
Event: File Type Blocking
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怎會這樣?

我是用和信adsl
有時自己也會收到標題如下的E-mail:
Welcome to my hometown
Meeting notice
A new website
Scrolling

我也懷疑自己是不是成了轉寄怪東西的跳板
我現在用Win2000server, norton antivirus2002不能灌只能裝nav2001
但是我用outlook2002,nav2001的電子郵件防護抓不到outlook2002的帳號
不想改用別的系統,有沒有別的解決方法或是有什麼軟體是專門防護電子郵件的?