Asturias,
Thanks for this but I may not have explained the problem very clearly. The now missing taskbar is the All Apps taskbar that is normally accessed by the windows key on the keyboard or the start button in the bottom LH corner of the screen. When working normally this taskbar runs vertically down the LH side of the screen. Neither do this any longer and I cannot find any means of getting it back to how it was. Any suggestions are most welcome.