Thanks Springfield. The problem I had with Windows Vista (before I moved to Windows 10) was that I had difficulty in "waking" up the computer after I put it to sleep. Hence I now leave it switched on from morning till night and only switch it off when I go to bed. I am aware that there are other members who leave it on all the time, unless they are going away for a week or more. I use a desk top in preference to a laptop.