If it is less than 30d since you upgraded the you can roll back to Windows 8
Update and security
If the roll back option isn't available you will have to reinstall Windows 8 from a Windows 8 recovery DVD/USB that you should have made when you first got the computer. You can also make a Windows 8 recovery USB from Windows 8 media creation tool (google it) and a blank USB
If you've had Win 10 for less than 30 days, the steps are:
Click Update and Security
Click “return to Win 8.1”
If 30 days has passed you will have to reinstall Win 8.1 using Win 8.1 software
Backup all important files and reinstall Windows 10.
NOT Impossible. You will have to format the hard drive, and install Windows 8 again. Then go here: https://www.grc.com/never10.htm
to stop Windows from Auto-Upgrading.
Start > Settings > Backup and Recovery > Restore > Rollback
les Impossible… your computer will turn off and update again eventually so unfortunately its useless
every time I ask a question, even if its the easiest one, they cant offer me a proper informed answer on this site. Wtf happened to people that actually make the effort to write an answer..