register a service in Windows

Hi,

I'm trying to start automatically 3 postgresql services in Windows without
success.

What I already do:
1) Install postgres8.4.2 binaries for Windows - ok, this service installs
automatically without any action mine;

2) Created 2 new clusters:
C:\Program Files\PostgreSQL\8.4>bin\initdb --pgdata "C:\data5" --encoding
'UTF8' --locale 'pt_BR.UTF-8' --username postgres
C:\Program Files\PostgreSQL\8.4>bin\initdb --pgdata "C:\data7" --encoding
'UTF8' --locale 'pt_BR.UTF-8' --username postgres

and changed the postgres.conf contained in each of these directories:
in C:\data5: port=5430
in C:\data7: port=5434

3) Started pg_ctl manually and worked with the clusters/databases inside
pgAdminIII, including port 5432:
C:\data5>"C:\Program Files\PostgreSQL\8.4\bin\pg_ctl" -D "C:\data5" -N
postgres842w5430 -l logfile5430 start
C:\data7>"C:\Program Files\PostgreSQL\8.4\bin\pg_ctl" -D "C:\data7" -N
postgres842w5434 -l logfile5434 start

But, I want to start each cluster automatically.
1) If I try to register
C:\data5>"C:\Program Files\PostgreSQL\8.4\bin\pg_ctl" register -N
"postgres842w5430" -D "C:\data5" -U postgres -P postgres

comes the message:
can not open the service manager

2) In regedit I can see:
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-8.4
HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Services\pgsql-8.4

but, how can I add a new service?
In Installations there is a key "Data Directory" - then, to start another
cluster I needed to install binary PostgreSQL again with new parameters?

3) I tried to left these commands at autoexec.nt without success.
4) I tried to use batchrun to add these commands at startup and worked, but
I needed an icon to stop the processes.

Help.
How can I start these 3 data base areas as a service in Windows?

Thanks in advance.
Josi Perez