> Postgres is starting automatically for me at startup.
>
> When I boot up my machine and then check the running
> processes I see postmaster.exe and 4 postgres processes.
>
> How can I stop this?
>
> I don't want Postgres starting up automatically.
You don't tell, but I guess that you use Windows.
Set the service that starts PostgreSQL to anything but 'Automatic'.
Yours,
Laurenz Albe