Authentication Failed - new user installation

I have installed 8.2 on a Windows 2000 laptop.

I think it is installed. From the pgAdmin, it shows "Servers (1)" and
it is named PostgreSQL Database Server 8.2 (localhost:5432). Right
clicking for says I can stop services or disconnect so I am guessing
that it is running.

Is that correct?

Under that, there is a Databases(1) folder with the component
"postgres". Right clicking on it does not give a choice to start or
stop. What is this telling me?

On the file menu, when I select "add server" and fill in the boxes, I
get an error message "An error has occurred: Error connecting to the
server: FATAL: password authentication failed for user
myadminaccnt."

When I setup 8.3, I used my myadminaccnt password for the
installation, I used it again on the next request for a password. So
I have used only it for all the requested passwords.

I don't know if this has any relationship, but when I installed 8.3, I
tried to use myadminaccnt as the user name but it said that was
missing a right so I elected to let 8.3 build a user "postgreadmin"
with the same password.

How can I go forward? When I build this again on another machine, how
do I avoid this problem?

TIA,
Ray