Thanks pal, but I have the CD that came with the router... problem is I don't want to go around the 30 computers and install the disc on every one. The printer was installed on a small usb print server that was connected to the old router, but we have replaced the router (and the need for the print server) with the N600. (print server built in)
The problem is that the old print server (IP 192.168.0.20) worked ok, but now the new router has assigned 192.168.0.3 and yesterday it re-assigned 192.168.0.4 and no one could print to it (even the 3 pc's that I installed the cd on), hence the reason I want to assign a reserved IP via mac address for the printer. This way all the clients will always print to the same IP no matter what IP the router dishes out ... hope this makes sense