Am seeing the same issues here on a fully patched XP SP2 system that had Acrobat 7 Pro on. I did a full uninstall, reboot, then installed Acrobat 9. Installation went fine, but pretty much nothing is working properly, giving the runtime errors. I tried the suggestions posted here to no avail, as well.

I installed the application on drive D:, not C:-- I may try to uninstall and put it on C: as I've noticed at times Adobe's apps seem very unhappy not in their absolute default locations.