Hi,
Have a look at the Trendmicro offerings, the SMB version is probably what you are looking for. http://www.trendmicro.com/en/products/suites/csm-smb-suite/overview.htm

The PC-cillin Internet Security 2006 is great for home computers http://www.trendmicro.com/en/products/desktop/pc-cillin/evaluate/overview.htm

>I am running Windows Server 2003 Standard Edition.
>
>Does anybody know a good software to protect the server.
>
>Sergio