I have a rather old computer which I bought shortly after Vista was introduced. I upgraded to Windows 8 a couple of years ago then took advantage of the free upgrade to Windows 8.1. Unfortunately I later encountered problems and needed to repair the computer. I had a repair disk for Windows 8 but, as I had downloaded 8.1 from the internet, I had no repair disk for Windows 8.1. As a consequence I re-installed Windows 8 which I found perfectly serviceable. Over the last couple of days Windows has spontaneously attempted to install Windows 8.1 again. After a long time I am told that the installation was unsuccessful and my previous system is being reinstalled. This is a nuisance. I can live with the constant suggestions that I should upgrade because I can simply say no. Can I stop Windows trying to install Windows 8.1 automatically?