Adobe Distiller and Acrobat 8.1 Error

I hope this is the right place to ask this, but I have been encountering a very frustrating error. "Error: 4350 - This file is currently not available for use on this computer." In addition, whenever I attempt to read a PDF file or open Acrobat (ver: Acrobat Standard 8.1) I get the Windows error "Adobe Acrobat 8.1 has stopped working". I tried uninstalling and Windows wouldn't allow it. I tried repairing or reinstalling it from the CD-ROM, and I got the message "The installation source is unavailable." And just for clarification, all of this was attempted both from the user's login AND the domain Administrator login.