Shared Printing - invalid access code

I have networked an XP machine and an ME machine

On the XP there is a USB Epson 680 set up for shared printing.

Sharing files is working fine - I have Nortons firewall on
both machines that is configured for access for both
machines - problem still happens if I disable firewall on
both machines

When I try to print to it from the ME machine
I get the following error message with the dialogue box
titled PRINTERS FOLDER

"There was an error writing to \\STUDYPC\Printer for
printer [EPSOM Stylus COLOR 680]:
The access code is invalid

The printer will be set to work offline.
To save your print job in the local printer queue, click OK"

I have searched the knowledge base and not found anything
relevant except a similar problem but with a specific HP
printer - which needed registry editing - which I didn't
want to do if it was not relevant to the Epsom

Any pointers anyone can give will be geratly appreciated

regards

Mike