posting this in the Vista forum.
At a guess, I'd say you may need to disable UAC for the re-install. Or you could try rolling back (or whatever system restore is called, now) to before the problem occurred.
I have a pc with Vista. My printer Hp all in one. I was printing fine then it just stopped recognizing the printer. I uninstalled software. When I tried to reinstall I received the error message: missing registry keys. slbcsp.dll, sccbase.dll, gpkcsp.dll & Enum.
How do I reinstal or repair these registry keys so that I can reinstall hp software.