I cannot uninstall using add/remove or with the manual instructions in KB400769. Add/remove gives me a 1402 error and the key has "unknown" in it. KB400769 fails when removing registered files acdoiehelper.dll, acropdf.dll, and pdfshell.dll with "access denied". Windows install clean up doesn't seem to have any effect except to remove it from the add/remove list. Updates to 8.1.4 don't work (1402 again) nor does trying to download 9 (1402). How in the world do I get rid of it so I can install later versions of reader?