http://www.askvg.com/windows-10-tip-restore-classic-context-menu-in-explorer-and-desktop/

If you also want to restore classic context menu in Windows 10, check out following simple steps:

1. Press WIN+R keys together to launch RUN dialog box. Now type regedit in RUN and press Enter. It’ll open Registry Editor.

2. Now go to following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\FlightedFeatures

3. In right-side pane, create a new DWORD ImmersiveContextMenu and leave its value to 0

4. Close Registry Editor. You’ll need to restart or log off to apply changes.