Microsoft Knowledge Base Article 308691 contains the following summary:
This article describes how to obtain the latest security information for Windows 2000 and Windows NT 4.0. You can use the links in this article to download security hotfixes, patches, and updates that may protect your computer from a malicious user. Other information about how to secure your computer and implement basic security practices is also available in this article.
Microsoft does not provide software that can detect or remove computer viruses. If you suspect or confirm that your computer is infected with a virus, obtain current antivirus software. For a list of antivirus software manufacturers, click the following article number to see the article in the Microsoft Knowledge Base:
49500 List of Antivirus Software Vendors