Prevent teamviewer from starting with windows

Hi,

I have tried to prevent teamviewer from starting with windows. I only want it to be enabled when I actually want to use it (security and such). I have tried to disable it through the program itself, through the windows service manager and even by disabling it in the task scheduler, but non of those seem to persist. Every so often it keeps enabling itself (mostly through the service), without my permission.

So first of all, how can I permanently disable teamviewer on startup and secondly, why are you using multiple methods to keep teamviewer on when I try to prevent it from doing so?