Press Winkey + R type regedit and press Enter to open the registry editor.
On the Registry Editor, go to the following keys (you can copy and paste on the address bar)
HKEY_USERS.DEFAULT\Keyboard Layout\Preload
HKEY_CURRENT_USER\Keyboard Layout\Preload
On each one of these keys, on the right side of the window, delete the values below that indicates the keyboards that you want to remove.
Spanish Mexico - 0000080a
Spanish Spain - International - 00000c0a