How do I repair a corrupt Admin Password?

I'm running am iMac 10.9.5. Recently I Installed Adobe CC, and ever since, I've been having issues with my admin password. My computer no longer recognizes it. So I'm effectively unable to update or install programs, or change any settings. Somehow it shifted from requiring a log in password at start up, to logging in automatically, and then I get the message "accountsd wants to use the login keychain."The admin password works in this case. I reset my keychain, but that didn't solve the problem. I tried to repair the keychain, but that requires an admin password and in this case it doesn't work. I'm at a loss. Any ideas?