You have one month from the day you install Windows 10 to be able to go back to your previous version of Windows
If you suddenly find out your computer has upgraded to Windows 10 and you don’t want it then it is easy to remove. This is a quick help guide without photos.
1. Click the Windows button and choose ‘Settings’.
2. Click the ‘Update & Security’ option’.
3. Click the ‘Recovery’ option on the left.
On the right you will find an option to revert to your previous version of Windows be it 7 or 8.1. Click this and follow the prompts (and decline the offer to look for updates). Your computer will reboot and should restore you back to your previous version.