The following will work, assuming that the users do not have a profile set up which they want to keep.
Log onto a workstation as an Admin user, Set up the printer and all of it's correct settings.
Through System Properties, User Profiles, select the administrator profile you are using and then copy. Browse the directory to %systemroot%\profiles\default user and copy it there.
If the users have profiles listed in the profile list, then delete them (provided you know that they do notneed to keep any settings already in their profile, or items on their desktop etc). If you use roaming profiles, then you will need to kill the profile on the server also - although NT will detect the later profile date, is good practice to remove the server copy also.
When the user logs on, they will now get a copy of the new profile, including the new printer.
If you don't want to delete the existing profiles, then I would suggest using a WSH script to install the printer for each useras they logon, the o