I found some good info, but I think it's old info.
http://www.flatbed-scanner-review.org/35mm_slide_film_scanners/35mm_film_slide_scanners.html
he says a routine flatbed scanner w/an adapter is not that good a result.
I'd like to find a dedicated slide scanner for @ $100 that's decent.
his suggestion is to use "Silver Fast" software.