There could be following 4 different reasons why installation of Adobe Photoshop Elements may rollback :
1. Conflicting processes running.
Resolution: Close all the Adobe applications inside Task Manager. Ensure that no Adobe process is running while installing the software on your machine.
2. Updater API failure.
Resolution :- Create an empty folder say “abc” inside “C:\Program Files\Common Files\Adobe\AAMUpdaterInventory\1.0\” location
3. Failure in AFL calls
Resolution :- Make sure that you do not have any other Adobe application installed on this machine. If none, then delete cache.db file inside this location “C:\Program Files\Common Files\Adobe\Adobe PCD\cache\”
4. Installation Location
Resolution:- Place the installer at say “C:\PSE9\” folder location and then try to install again.