I've noticed, upon close inspection of the affected disk, some small "splotches" on the data side. It doesnt fit with the writing on the front (which were made with assumingly CD-safe markers btw) but I'm beginning to think it's what's causing the problem :( And if so, there's probably no cure. It's three small "splotches" with rainbow-coloured rings around them. Situated midway between the center and the rim. 

I have no idea what has caused them, perhaps some drops of something long ago hit the CD?

So far I haven't managed to read it, but I haven't given up, I'm trying to rig an old computer to run, I have loads of old computers here in all states of disassembly L so it should be possible to get one in an operational state. Thing is, it's probably not enough :(

Dammit it was my oldest Poser backup CD with all my very old stuff. The installed stuff is still in my Runtime (and I have backups of that!) but I think there were also some of my very early renders... :(

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.