I'm trying to add a printer on Mac OS X 10.5 using iPrint, however I get the error message "iPrint Lib - The administrator may not have assigned a driver or the server may not support printer/driver installation for this platform". As the IT administrators "only support Windows", grrr, they will not upload a Mac driver to the server.

I have the printer driver. Is there anyway of installing the printer manually? I've tried just adding it by IP address and it installs but I just get a "Network host is busy" message when trying to print.