There is a Microsoft article at https://support.microsoft.com/en-gb/help/299357/how-...
which offers a downloadable reset utility. Although it doesn't specifically mention Windows 10 it will work OK. Did you run the command prompt in elevated mode, ie. as the administrator? If you download the utility make sure you run it as the administrator.
If so and you still get the access denied error (this indicates a permissions issue in the registry) this link shows how to overcome the problem,
If none of that works next enable the administrators account in Windows 10 by following the steps
Tap on the Windows-key. This should open the start menu or bring you to the Start Screen interface depending on how Windows 10 is configured on the system.
Type cmd and wait for the results to be displayed.
Run the the cmd prompt as administrator.
At the prompt type:- Net user administrator P$sw0rdY <enter>
(NB. change P$sw0rdY to a password of your own choice in the above command)
Then :- Net user administrator /active:yes <enter>
Test the activated Administrator: Switch User, or logoff
Logon as Administrator and try accessing the router from this account
Edited by rogerfp (Wed 15-Mar-17 21:46:23)