printer sharing with Windows PC's

My iMac is connected to an Epson R220 printer via USB. I have a Windows XP and a Windows Vista PC on my wireless network. When I attempt to add the Epson on the Windows PC's they can't find it. Printer sharing is turned on on the iMac. I would attempt to specify the name of the printer in Windows printer setup - but I don't know what to call it. Bonjour is installed on all computers.

Any ideas?

You have to do the printer set-up IN bonjour, not just have it installed.

Read This Article:
How Do I Print Wirelessly From My PC On a Mac Home Network :: My First Mac - Help Buying and Getting Started with Your New Mac

OK my stuff is exactly different from this.

I have a macbook pro, and my printer is connected to the Windows desktop in the living room. It is connected to the router via ethernet cable. And MBP runs wirelessly. How do i print the stuff from my macbook pro?