> I drag or Ctrl-C/V file between two explorer windows and a new window icon appears on a taskbar with progress indication
That's unusual. I just tried copying large swaths of files with varying combinations of Explorer snapped, unsnapped, overlapping, not overlapping, etc. In ever case the Copy window appears h/v Centered over the origin Explorer window.
Do you have anything that has custom Shell integration installed that might be causing some weird interaction? I tried this on a pretty bog standard install. I'll try to reproduce it later on a more customized system.
> The notice is mostly invisible (no dialogs)
Yeah, that seems like an area of user experience they could improve. Do you lock your PC? All my PCs require password unlock and when I unlock them notifications like "Updates were installed that require reboot" or "Windows Defender finished scanning your PC" always pop out from the Action Center briefly. That's been my que* to go inspect it.
> I manually install 341.81... some weeks later... a notification that driver was updated.
I'm curious what could be causing that. I have some old Logitech Webcam drivers installed because they removed some features in the Windows Update version of the Driver and it's never updated.
I guess you could go to extreme lengths and disable that function of Windows Update: http://winsupersite.com/windows-10/stop-automatic-driver-upd...
> See search results for "An App Default was Reset"
This seems to be a result of 3rd party applications changing file associations using mechanisms outside of the Windows Guidelines. This is a big problem for Microsoft with regards to the Start Menu Icons, Uninstall Utilities, Control Panel Programs, and apparently file associations. They have recommended specific ways of interacting with the OS since XP that have been routinely ignored. Now in Windows 10 they're making changes that break these unsupported mechanisms and are catching flak for it.
http://www.winhelponline.com/blog/windows-10-resetting-file-...