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"Failed to add window command bar exceptions" error message prevents Studio from opening

"Failed to add window command bar exceptions" error message prevents Studio from opening. I have tried everything: repair, uninstalling, reinstalling, article 6625 from the KB (since I also got the Message Type Initializer 'xxx' threw an exception. Nothing Works!! I really need to use Trados ASAP - I have a huge work load waiting!! Currently using 2015 Version. This happened when I started translating a Project received in a package - Studio shut down, and I have simply not been able to open it after that. It starts the loading, but instead of opening, it gives me this Message. PLEASE HELP ME!! Thanks :)