Well, I did get most of my libraries reinstalled, but I had to drag directories into my Poser 7 directory.  Each time I tried to specify a new Runtime location using the official Poser method, the Library label would show, but no files got imported.

My next job will be to try to reduce some of the incredible redundance in my files.

Does anyone else hate Poser's nonstandard  user interface as much as I do?  Apparently even the creators of material for use in Poser each have a different way of setting up their files.

Thanks for your help, BeyondVR. It didn't work for me, but it convinced me that I needed to do it the hard way!