This error occurs when trying to start the DB2 services.
If they have a SQL Server with a domain login (as apposed to the local service account) check
to see if this logon id is enabled and still exists and the password is correct.
Also, check to see if the user db2admin account is set to must change password on next logon.
If so, change it to password never expires. On a windows 8.1 system I couldn't find where to change
the db2admin password. So, typced cmd and then right clicked and run as administrator. This
opened the command prompt. Then typed command: net user db2admin db2admin (this made
the password db2admin) Then typed another command to have it never expire: net user db2admin /expires:never