I'm sorry about the issue. Do you mean you've upgraded to Windows version 10, but you'd like to go back to your last Windows version? Please try the following:
- Click on Start (which is the windows logo icon located a the bottom left of the computer's screen), then click on Settings. Then click on Update & security, then click on Recovery. Then there, you can click on the option to go back to your previous Windows version.
Please reply at the box below to continue troubleshooting. Thank you.