I've got an alternate, perhaps easier answer for you.
Download "Dave" by thursby software. Make sure both of your PC's are on the same "workgroup" name. Enable netbios on your windows PC [for the *internal* network only, make sure you dont expose netbios to the internet]. Also make sure "file and printer sharing" is enabled in windows networking setup.
Then [still on your windows PC] go to your windows Printer folder , right click on the printer you want to share, tell it to share the printer via the sharing tab, give it a name, and then go back to your mac.
Once DAVE is installed on the mac, go to print setup on your mac [print center inside utilities], and a new choice for connection is enabled - "DAVE POSTSCRIPT PRINTING"
All you have to do is select that, then a browser will pop up for your workgroup, just browse right into the name of your shared printer, select it, and you are set!
[Doh- those instructions are long winded, but I promise you, it is very easy and straightforward, provided that your network is setup correctly, and your mac and pc can already talk to eachother somewhat.]
If you have any problems, the dave manual has all the tutorials you need.
Good luck and hope that helps!