Let me start from the beginning, I finished the main quest in Nehrim, and my brother wanted to finish playing Oblivion, so we copied over his Oblivion folder from his laptop to my new desktop (my desktop has a higher GPU then his laptop), and my brother was able to play Oblivion just fine.
I wanted to play some side quests and go exploring in Nehrim, so I renamed named my brother's Oblivion folder and my Oblivion folder along with my saved games folder back to their original file names, and I now get this error:
None of the master files used in this save game are loaded
I tried reinstalling Nehrim, but that didn't do anything. How do I fix this, so that I can play Nehrim again?