I have just installed postgreSQL and have set up the user postgres and its password. In the psql Shell I am able to login as normal however I can't login in Windows Command Prompt. When I run the psql command it asks for `Password for user username` for which I don't know the password. 

I have tried running `dropuser username` in the psql shell however this doesn't make a difference. When I use psql -u postgres to login and run `postgres=# \du`, the other role doesn't appear:

                                      List of roles
    Role name |                         Attributes                         | 
    Member 
    of
    ----------+------------------------------------------------------------+-----------
    postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}