Disable right-click in explorer

Paste the following in notepad and save it with a '.reg' extension.

Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] "NoViewContextMenu"=dword:00000001 [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] "NoViewContextMenu"=dword:00000001

Merge it with the registry. To undo it delete the "NoViewContextMenu" from the registry.