How do I get back to Windows 7

[cloguidice]

I mistakenly updated to Windows 10 when it was offered. I hit a key mistakenly and the update went though. My computer has had nothing but problems since. I want to get back to Windows 7.
How can I do that?

 

[BadActor]

http://www.pcadvisor.co.uk/how-to/windows/how-downgrade-windows-10-uninstall-win-10-reinstall-windows-7-8-summary-3633149/