Why do I get the message "the application has failed to start because the application configuration is incorrect. Reinstalling application may fix this problem" whenever I try to open a PDF file (both from Email and from Harddrive). I have Adobe Reader 9. Does anyone have any clues? Thanks.
Have you tried the suggestion of reinstalling Reader?
Uninstall, use the Microsoft Installer Cleanup tool to remove anything left in the Registry, then re-install.