Thought it would be that one or the version below with 2 ports.
Uninstall the bit of software and its a pain but make a note of the IP that is displayed on the screen. Launch your web browser and type in the IP address i.e.
http://192.168.2.15, it will prompt for a username and password, unless you changed it, to to TCP/IP and set a static address and save changes.
Now go to Printers & Faxes within control panel, right click it and go to properties, click ports, click add new, add a new standard TCP/IP port, click next, enter your IP address that you put into the print server earlier, click close, apply and ok. Do the same on each machine and you can print as and when needed.
It will work on Vista although the steps may be worded a little different for getting to printers and faxes in Vista, I cannot confirm these as I dont use it.
Any problems give me a shout. Hope this helps.