What's the version of your Mac OS?
Have you tried to connect to it using samba:
smb://PC1-with-the-printer/Printer-name ; <-- you need to access this via Finder then "Go to server"
You supposedly don't have to use this on a 10.4 above OS version, but in case dili nakit an sa imong Finder when you browse your network.
Do the samba connect and authenticate using the admin account of the windoezz PC.
If you need a guide here's a detailed help. Usually you setup your Mac printer and point it to you windows network workgroup.
[link]
Using a Shared Windows Printer from Your Mac with OS X 10.4 [/link]