I fear you will not get much more help here. This forum is called Enterprise Deployment (Acrobat and Reader) and you don't seem to have any problems with Acrobat or Reader.
(Reader, by the way, just reads PDF files, and has nothing to do with installing anything else).
Each forum has a different set of experts, so I recommend the Photoshop forum here http://forums.adobe.com/community/photoshop
Tip: please include full syptoms, especially error messages. "Won't even open a file" doesn't give much even for the experts to go on.
Good luck!