Hi its poser &, Vista, but not sure if OS matters really?
here's the history:

1. built a pc with 2 500gb hard drives, 1 IDE, 1 SATA.
2. Installed Poser 7 on IDE drive, added a whole load of new content to poser runtime, couldn't find anything  due to the huge number of folders in my 1 Runtime.
3. installed (a few months later) Poser 7 on SATA drive and uninstalled previous install (or so I thought)
4. set-up multiple external runtimes (also on SATA) as per tutorial on Renderosity.
   5)checked shrtcut pointed to new install (it did)
5. noticed that all old (additional content) folders still showing up in Poser runtime, even though they are not there when I check in Explorer!
6. noticed a problem with V4.2 morphs ++ not loading up when loading V4.2 from new 'figures' External Runtime
7. tried installing V4.2 stuff to SATA Poser runtime, couldn't find them
8. just added new runtime and navigated to the fresh install Poser runtime (on the SATA drive) V4 is there along with Poser-supplied content.
9. tried loading V4.2 - loaded, but no Morphs++

Arrgh! is there a way of pointing Poser to the new SATA poser runtime as its master (booting?) runtime?