Don't know about your Epson specifically, but many USB devices need the software to be loaded BEFORE the device is plugged in.
You might try de-installing as much of the Epson software as you can, loading the software that came with it according to the instructions, then plugging in the printer again. (assuming that you didn't follow the step-by-step instructions in the first place)
"If all else fails, RTFM"!
Good luck