|I already tried to reinstall from the original CD.|
It didn't help.
I checked the CD by installing on another pc, and there it works.
What puzzles me is, that I cant' find out what file is missing.
Just a few days earlier I used the scanner, and it worked.
I have not installed new programs in the meantime, but an importen file, belonging to the main system must have "left" my computer or be corrupted.