I currently have Reader v8.2.5, which I would like to uninstall because it will no longer open PDF files ("Invalid plugin detected. Adobe Reader will now close.") However, when I go to ADD REMOVE PROGRAMS to uninstall it, I get "This patch package could not be opened." so I can't uninstall it. Further, I downloaded Reader vX which seemed to go fine, but when I try to open it, I get "This application has failed to start because MAPI32.dll was not found. Reinstalling the application may fix this problem." When I try to reinstall, I get an error stating that the program has already been installed. If I try to repair it, it appears to finish (it says "complete") but I get the same message ("This application has failed to start because MAPI32.dll was not found. Reinstalling the application may fix this problem.") when I try to open it. I've been told my anti-virus program may be impacting the download so I turned it off but it didn't seem to make a difference. Any suggestions?