Hello,
You have a protocol problem. XP does not listen to AppleTalk; only Windows 2000 Server and 2003 Server do (Well, NT 4 does too). When you check the box to share the printer on XP, you are setting up a SMB sharepoint... SMB <> Appletalk. This is one of several fundamental differences between a Workstation OS, and a network server OS.
You MIGHT be able to use OS X to share the printer using SMB protocols, but I am not sure that is supported.
You might also need a solution on the Mac side to see the printer, such as Thursby Software's Dave product. What you are trying to do is enable a print server.
P.S. Epson gives Macintosh tech support. Never had a problem with it.
Let us know,
Christian
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