I got help from this page 10 years ago ! Many thanks, my 1650 scanner finally worked with W7.
Today I had to completely restore W7 and rebuild my trusty Shuttle (SH67), and of course my Epson 1650 needed help, too.
I returned to this thread, obeyed the previously excellent instructions, and now my scanner is re-united with my Shuttle, and I am back at work again.
There are few things to celebrate these days, except W7Forums. Thank you very much again for such a helpful thread.