I got a bit annoyed today.
The reason being how Windows 10 automatically found out that a new device driver was available for my Nvidia graphics card, through Windows Update.
Then Windows simply went ahead and installed it for me while I was away from the screen for a couple of hours. In previous Windows versions (Windows 7/XP), you had the option to disable “optional updates” as you pleased.
This is no longer the case in Windows 10 (and 8.1).