I just did a clean install of Windows 10 (Pro N) and installed iTunes (126.96.36.199). Now for some reason iTunes automatically starts whenever I start my PC. I've already tried to find a solution on this site and google and followed different steps to no avail. I've tried:
In Task Manager -> Autostart: Disable anything iTunes/Apple related. I only have "iTunesHelper" and tried disabling it, but iTunes still starts up automatically.
Use CCleaner: Again, only "iTunesHelper" as Startup, and disabling it doesn't change a thing.
In iTunes -> Settings: I've disabled automatic sync with iDevices. I also don't have any iDevices plugged into my PC on startup.
In msconfig: I disabled all services related to Apple. The startup tab is only a link to the task manager again.
In registry: I checked local and current user services, and disabled "iTunesHelper" here too, without a change.
(update) Autoruns: I downloaded AutoRuns for Windows and unchecked everything related to Apple and/or iTunes, but this didn't prevent iTunes from launching either.
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.
Corsair Utility Engine: I have a Corsair K70 RGB with media controls, so I disabled CUE automatic startup in task manager. 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. Now it doesn't automatically start anymore, but iTunes still launches.
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. iTunes still automatically launches on every startup.
Now I'm running out of ideas why iTunes is automatically starting up on every launch. Does anyone have an idea what could be causing this issue and how to resolve it? The only thing that is actually working is uninstalling iTunes, but that is not really an option for me.
EDIT: I don't know if it may be hardware related but just in case, this issue occurs on a PC with an i5 3570 with a HD7950 on a GA-Z77X-UD3H. The system and iTunes itself are installed on a 850 EVO, and there's another SSD (Intel 520) for games and HDD (Seagate Barracuda) for media/backups built in.