I need a list of Virus Scanning solutions for a Windows Server 2003 64
bit edition.

Any possible candidate must specifically support "Windows Server
2003" although they do not specifically need to mention support for
the 64 bit version--alternatively they can be well known by the
community to support Windows Server 2003.
 
The list does not need to be complete, it simply needs to be a few
vendors that I can compare with each other and use to make about a
decision as far as what to use.

My goal is not to catch viruses.  I simply need to have a scanning
software in place in order to fullfill some security requirements. 
The less intrusive/faster the software the better.

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Clarification of Question by dracocat-ga on 12 Sep 2006 08:01 PDT

BitDefender has a version called BitDefender for File Servers.

This seems to be working well.