With a bit of trepidation I have upgraded my Dell laptop with Windows 10 and everything was fine. As a precaution I have created a USB recovery stick. When I tried to boot up the laptop with this drive, a screen came up asking me for the keyboard language I wished to use. At the bottom of the screen is an option for more keyboard languages, following the short language list beginning with A. However I couldn't find a way of accessing more languages beyond the first page. The mouse at this point was not recognised. So there must be a keyboard press which I have missed and I am just wondering what it might be?