I'm pretty sure the best solution for this problem would be a reinstall unfortunately. When a file is corrupt, you can't really do nothing about it other than reinstalling to refresh the official files and put them back to the right directory. When editting, moving or removing files, this kind of thing will most likely happen if it hasn't been done right. It might be possible that there is a bugged file, which would be an option if you removed, replaced or editted files many times. Remember to always keep the setup of your games/mods at all time so when this kind of problem occurs, you dont have to redownload everything. If I was you, I would reinstall, it would probly save you more time than if you actually look for the right answer.