You could uninstall AE and reinstall it. Happily, that's a pretty quick process with CC
Oooh, after you uninstall 13.7, check for this folder and delete it:
C:\Program Files\Adobe\Adobe After Effects CC 2015\Support Files\Plug-ins\MAXON CINEWARE AE
Then Re-install AE 13.7
Thanks Szalam, I didn't want to try that because I wanted to keep all my plug ins and scripts but obviously one can keep all the pref folders.
I'm glad you're up and running!