My apologies, and thanks for the help.I have no idea how I came to post two different versions of the same topic, it must have been another 'senior moment' I am afraid. It is not only computers that have memory problems.
My XP is working quite well now, except in one respect: the trackpad does not work at all, while the mouse is OK. Am I right in thinking the Synaptics driver for the trackpad will also be the mouse driver? If so I am reluctant to just update the driver for fear it will mess up the mouse, which has taken me so long to get working. And when I did try to update the driver some months ago I got the response that there is no newer driver available, whereas now I get told that the software the wizard tries to install is older than what is already present. The only 'error messages' I am getting now are to do with this, such as 'found new hardware' and 'need to install software for it'.
It was Tab which helped me to login, moving the cursor over my account name. Now I can use the mouse from soon after the computer starts.
I dont want to abandon the XP just yet, I feel there is still some life in it, it is pleasurable using the Laptop for a change now it is working quite smoothly, However, I dont want to spend too much time with it, such as factory reinstall or a different OS, as most of my efforts are directed to struggling with Windows 10 on my 2-in-1 Tablet. The upgrade went alright but the November update (probably) has trashed most of the Microsoft apps (and others) including the Store itself. A number of us are waiting in hope for Microsoft to issue a working fix, we have tried a host of things none of which work.
Details of the XP: Acer Aspire 5001 Laptop, DDR increased to nearly 1000MB some years ago.60 GB HDD