Problems with Postgresql under Windows XP pro

Hi Postges-Admins,

I have installed Postgresql-7-3-1 on two windows systems, a W2K-pro and
a W-XP pro system. The installations have been completely identical,
ipc-daemon and postmaster are installed as services with the following
commands:

ipc-daemon:
cygrunsrv --install ipc-daemon --desc "CygWin IPC Daemon" --path
/usr/local/bin/ipc-daemon --termsig INT --shutdown

postmaster:
cygrunsrv --install postmaster --desc "PostgreSQL Database Server"
--path /usr/local/pgsql/bin/postmaster --args "-D /usr/local/pgsql/data
-i" --dep ipc-daemon --termsig INT --user postgres --shutdown --stdout
/pgsql.log --stderr /pgsql.err

Both services are successsfully running. The rest I did like described
in the README and FAQ files (cygwin, user postgres, initdb ...). Every
task was running without error.

Now the problem: with windows XP-pro it is not possible to get a
connection to the database, when the user is not Administrator.

"psql -U postgres template1" is running seccessfully only as user
"Administrator". Every other user gets a error message.

With W2K-pro everything works fine.

Is there anybody who has resolved this XP problem?

Thanks a lot,

Ralph