Did you do an "easy install" or a custom install? The default (easy) install does not include some of the epson printer drivers. Many of them are in the second epson printer package, which needs to be enabled in the custom installation.
However, I think you can add them later yourself anyway. Try inserting the third disk (or is it the second?) and look for the epson 2 package.
I can't remember if the 740 is in the epson 1 package (installed by default) or the epson 2 package (not installed by default).