Computer question: Convert Windows 2000 Server to Professional

I have a Windows 2000 Server here for testing purposes. It is not a domain controller, and is really not used as a server in any way. I am tearing my hair out trying to find a utility that will “convert” Windows 2000 server to W2K Professional so I can try out some free anti-virus programs. It just patches some dlls to change how the OS identifies itself, since there is really little difference between Server and Professional. I know that such a utility exists because I’ve used it before, but I have no idea where I got it or where I put it.

Help please!

Ah I found it. The program is called “NTSwitch”.