I have downloaded the Adobe Support Advisor ( apparently been withdrawn according to the Adobe website) and it located no errors.
Again I say that the Elements Organizer program is missing as there is no Elements Organizer 12 sub-folder within the Adobe folder located in C drive where the program is installed (Photoshop
Elements 10 has an Elements Organizer 10 sub-folder and the organizer works fine).
Also on clicking the Photoshop desktop icon (loaded by the program installation) message says "cannot find Photoshop Elements 12.exe. However the program can be loaded from the PhotoshopElementsEditor 12.exe file, but the organizer button at the bottom right of the editor screen when clicked gives message " loading elements organizer workspace" and after a minute or so this message disappears and nothing happens.
The download is an upgrade version so I don't whether this makes any difference.