My Phone Installed a Duplicate System on Top of Existing One. Uninstall How?
I'd try to do a full backup of your entire phone contents as is with Kies, save to your desktop computer, then factory reset and start over and use Kies to try and selectively restore the data you're trying to recover.

According to a thread on xda here when using Kies Restore it extracts all contents of the .sbu backup file to C:\Users\{LogonName}\Documents\samsung\Kies\sbu\temp\{NumberID}\{Files Extracted} which you could try to explore and see if you can access the data from there.