If you currently run Windows 7 or Windows 8.1 you are probably eligible for a free upgrade to Windows 10
You may have noticed the new Windows icon in your task bar which allows you to reserve your copy of Windows 10
Once reserved Microsoft will stream down the installation files whilst you work and advise you when they have been received
The upgrade is straight forward but bear in mind this is a major change so please ensure you have all your important data, photos and music backed up before you do the upgrade