What version of InDesign? What did you upgrade from? Win 7 or Win 8?
Have you tried trashing your preferences?
Thanks a lot for your answer!
It's Version CS4.
I upgraded from Windows 7.
By the way, on my other pc (it's a notebook), where I also installed Windows 10, I can open InDesign without any problems!
What do you mean by "trashing the preferences"?
CS4 is unsupported under Windows 10 and that large an upgrade for the O/S is a crapshoot. You might consider a clean install if nothing else works but it won’t change the fact that CS4 was never tested under Windows 10 and you are on your own.
Thanks for your help!
The only strange thing is that on one pc it works and on the other not.
Perhaps I uninstall and install the programm again as you recommend.
Not so strange. When it's unsupported in this way things become unpredicable. Working, or part working, on some PCs not others is typical.