Thanks borgus1. My install files were on a L: drive; my system evidently is on C (an SSD) and my users are on D: (my progs too, except for Cyberlink and others that I want speed for).
So I tried your suggestion this morning: tried to install from C: and after that from D:.
PD13 always want some Windows Media Player component (though it is fully functional). My other Director suite 3 programs all work well.
I tried some suggestions from Cyberlink support too ... to no avail.
I keep the matter open and expect further "solutions". I'll keep you informed here if something works.