• Windows NT® 4.0
• Windows 2000
• Windows XP
• Windows Server™ 2003

• Windows Millennium (Windows Me)

Note:  Windows 98, Windows 98 Second Edition (SE), and Windows 95 also are not affected by this issue. However, these products are no longer supported. Users of these products are strongly encouraged to upgrade to later versions.

Click here for the Welchia Worm Removal Tool:
Symantec Security Team web page with Welchia removal tool

Click here for another story about the Welchia Worm:
CNN Story regarding the Welchia Worm Virus