That epson page seems to say to use the win2k driver. I think I tried to use the win2k driver with me stylus900 and had some errors, as well. I'm not 100% sure I ever tried, tho. I know that they used to tell you to use the win98 drivers with win2k(before they had win2k drivers). When using the win98 drivers in win2k, there were errors, but you could just cancel them out and the driver installed fine.
My computer is down until I get a new cpu, else I would try for you.