Running the setup it finds the WPS54G server,IP 198.168.0.101, but after hi-lighting, and clicking next, after a delay, a window opens that says "network busy, or device not found". I'm running Vista home premium, on a Dell XPS laptop. This server has always worked great on Win XP.
Make sure your firewall is set on the Vista to allow the network discovery. Follow this link, click on Networking>File and printer sharing. It will tell you how to setup Vista to work with printer http://windowshelp.microsoft.com/Windows/en-US/networking.mspxsharing.