You are getting below error message while trying to connect to the SQL Management Studio.
Login failed for user. Reason: The account is disabled
Solution
Obviously, you cannot login with your current user and you will need to use other user to enable back your disabled user.
To do this, right click on your user and select Properties. You can obtain this from Security > Logins.
Go to Status and select Grant for Permission to connect to database engine and Enabled for Login. Click on OK.
