Printer sharing Question

We have 2 VISTA computers (Dell & Medion) on a network using a linksys router.
They can both see and use each others Public areas - no problems there.
The printer (Dell 926) is connected via USB to the Dell and can print fine
from there.
The Medion can see the printer and through the properties can see print jobs
going to it both from teh Dell and spooling from itself).
However, when it sends its own print jobs these spool through the print Q
but never print.
This happens whether the link is wired or wireless.

Any help appreciated