Take a look at Viewscan – it’s a third-party scanning program that handles a lot of older scanners. I think you can download an evaluation copy. It’s a well-known product, so a Google search should quickly locate it. The author’s name is Hammick.
Thanks for the advice. Sorry for the late reaction. I have been very busy last couple of weeks. I tried to download/install Viewscan last year, but somehow I wasn’t able to get it running. I wonder whether the Minolta Software runs using Windows 7.