I modded KSP with around, let's say, too many mods (at least 18), and now, in light of 1.3, none are up to date, but I cannot delete them either. It gives me a "missing permissions" error when I try. This happened before, and I uninstalled Steam and reinstalled, but I don't want to do that every time a new update rolls out. I can't reinstall just KSP, because that gives me the same missing permissions error. Help?
Edit: Here is the error I am getting.