Hi Benedikt and welcome to our forums,
Thank you for your interest in Advanced Installer.
There are several method that you can use to start a service from Advanced Installer.
The simplest one is to use our built-in support, from Services page
. There you can add a simple "Control Operation" and configure it as desired.
If the service requires a custom method to start it, than you can launch your BAT using a custom action
. To make sure the custom action runs with full admin privileges you need to set it as "Deferred with no Impersonation".
If you have other questions please let me know.
Also, please do not duplicate a forums post over e-mail, they have the same priority for us and you will get the same answer.