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iTunes still automatically launches on every startup.
WD MyBook: I have an external hard drive with a lot of media (music/videos) on it, so I unplugged it and then restarted my PC several times. Now it doesn't automatically start anymore, but iTunes still launches. Logitech Gaming Framework: I have a Logitech G700 with media custom controls, so I disabled LGF automatic startup in task manager.
Corsair Utility Engine: I have a Corsair K70 RGB with media controls, so I disabled CUE automatic startup in task manager.
Some more googling gave me the idea that the problem could be a different program/device than iTunes itself, namely a device with media controls or an external hard drive with media.
In registry: I checked local and current user services, and disabled "iTunesHelper" here too, without a change. The startup tab is only a link to the task manager again. In msconfig: I disabled all services related to Apple. I also don't have any iDevices plugged into my PC on startup. In iTunes -> Settings: I've disabled automatic sync with iDevices. Use CCleaner: Again, only "iTunesHelper" as Startup, and disabling it doesn't change a thing. I only have "iTunesHelper" and tried disabling it, but iTunes still starts up automatically. In Task Manager -> Autostart: Disable anything iTunes/Apple related. I've already tried to find a solution on this site and google and followed different steps to no avail.
Now for some reason iTunes automatically starts whenever I start my PC.
HOW TO AUTOMATICALLY LAUNCH PLEX ON MAC INSTALL
I just did a clean install of Windows 10 (Pro N) and installed iTunes (12.2.1.16).