A few things...
Check Apple's site and confirm they support that printer - no driver, no luck
I haven't tried this, but can you connect using smb://yourpc/printershare?
Because Epson didn't bother to write a printer driver for my Photo Stylus 700, I had to buy one from a third-party,
www.iproofsystems.com. The driver works very well under OS X althought I'm using it with LPR, not a Windows Share. Not sure if it will work with a Windows share - check their web site. Let me know what you find and I'll check my copy.