When I bring up PhotoShop 7.0.1 and select Epson Twain5, it for some reason thinks I am selecting a camera and bombs out, because I do not have a camera connected to my computer.

When I bring up Image Ready and select Epson Twain5, it works.
Why doesn't PhotoShop work?
And, Why when I select Epson Twain5 it thinks I am selecting camera?