Thanks for the question, and welcome to Apple Support Communities.
I understand that you are having issues with launching Keychain Access. The following resources may help you troubleshoot this issue further:
I have looked at your suggestions but none of them seem to be usefull for this problem.
The problem is getting worse now. I can't access the KeyChain Access application. Now in all my application that are dependend on it I have to login manually.
Is there a way to reset or cleanup KeyChain Acces without having to open it?
Thanks for your reply.