Ruth - If you do right click on Microsoft logo left hand side of taskbar, click on Power Options, then click on "Change Power Settings that are currently unavailable", you should get 4 more options. If you click them all, then when you right click to shut down the computer, you should get the option "Shut down or sign out", click on that and you'll find Sign Out, Sleep, Hibernate, Shutdown and Restart. At least that's what I've now got.
Lizzie