It sounds like you have something else running in the background that is interfering. Do you have a font manager?
I always prefer to keep my computers the most simple thay is possible...
Tomorrow i will start to add my old scripts one by one to the right place to find the one that causes the problem...
Much of my scripts have long descriptive names....
Was your old PC XP?
Not sure about InDesign, but I had a problem with Illustrator last week where it was running a little eratic and crashing when we tried to export certain files.
I had to go directly to the application illustrator.exe - and change it to run in XP mode.
This made it run much better and we were able to export the files. Might not work for you, but could be worth a shot.
Thank you for you interest, Flippy. But now my problem is solved. As I have explained in my first message it was the number of scripts residing in the script folder.
But your solution is interesting too...