Using a Ethernet IP Printer with XP

My problem is the following: I have a Lexmark Optra printer connected with a Speedport Router as IP printer. That works fine with the Mac. I cant get this thing working with XP. There was a tutorial anywhere but I lost the location and forget to save the file. I can remember, I have to share the network printer in the PRINT & FAX panel of OS X. I enabled that but I am stuck (and a little desperate...). I urgently need a printout of a WIN program for my tax declaration...

Any help or suggestions would be greatly appreciated...

mk

UPDATE: could get the thing working with the Apple software BONJOUR for XP.

 

If you can ping the printer from XP cmd prompt... then set up a new XP Printer using the Printers Instructions - you do not need to use Bonjour or printer sharing unless you are having other issues.