i have just been informed that if your running win7 upwards and not win10 there is an automatic update that installs win10 without intervention
if you dont want win10 then turn off automatic updates or next time you boot your computer you will have win10.
i'm personally pizzed off at this as i bought win7 pro as i like it and i'm not interested in win10 as i have a feeling i know what will be there next trick.