i am on comcast WIFI setup, with XP home and dell computers dim2400 and optiplex 600 with the dell 720 printer

 

the  printer is connected to the wifi box which goes to the dim 2400. the optiplex is also connected to the wifi box, so both computers can get the internet, but only the dim 2400 can access the printer.

 

appreciate advice on how i can get the optiplex computer to access the printer.

thank you