Source: https://www.reddit.com/r/Windows10/comments/3h6e74/how_do_i_stop_windows_10_from_automatically/
Nevermind, WU definitely recreates the task.
BUT, the following did work for me (TRY AT YOUR OWN RISK, I TAKE NO LIABILITY IF YOUR SYSTEM BECOMES UNUSABLE): Open up C:\Windows\system32\
Right click on "MusNotification.exe"
Go to "Properties"
Go to "Security" tab
Click "Advanced"
At the top you'll see "Owner: TrustedInstaller" with a link to "Change" it. Click the "Change" link.
Type in your username and press Check Names. It should underline your username (and possibly prepend it with your machine name) if it finds it. If it doesn't, you'll need to figure out your username and make sure you get this part right.
Press "OK". Dismiss any warnings or alerts.
Press "OK" until ALL DIALOGS ARE DISMISSED (DO NOT APPLY PERMISSIONS YET).
Re-open the properties of MusNotifications.exe and go to the "Security" tab (seriously it's important that you REOPEN it after changing the owner).
Click "Edit..."
Click on "SYSTEM" in the list of "Group or user names"
Click on the "Deny" checkboxes for "Read & execute" this should also automatically "Deny" for "Read", if not then do so yourself.
Click Ok to dismiss the dialog again.
Go back into the properties for MusNotification.exe and go to the "Security" tab.
Click "Advanced"
Click on "Change" beside the "Owner" again.
Type in "NT SERVICE\TrustedInstaller" and click "Check Names"
Press OK.
Keep pressing OK until all dialogs are dismissed.
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