I decided to download all of the critical updates suggested by Windows Update plus .net framework (I have downloaded the trial version of Drive Image 7 and .net framwork is required for it to run).
When the machine boots up, I now have to click on the icon above my user name before the desktop loads. Also, at the login screen, there is a message saying that I have two undread mail messages but there are no new messages in my Outlook inbox.
Whilst these are not serious problems, I am curious as to why I'm getting what seems to be an incorrect mesage regarding unread mail and why I now have to log in.
My other son, who also has a hotmail account on his PC, has explained to me that there he gets the same message at the login screen if there are messages to be downloaded so perhaps I am on the right track.
The fact that I now have to log in at the 'Welcome' screen is still puzzling though.