Problem solved. Sorry for the long (previous) post.

I'm not sure what I did that worked. But here are some things I did.

1) Downloaded drivers from the Epson site and installed them on the Dell.
2) Entered the wireless settings manually on the Epson buttons.
3) Put the Epson install disc in and installed the drivers and software from the CD. I changed the options this time, installing it differently. This time I chose, I think, install on a pre-existing network rather than install printer for the first time.