I think you like to factory reset your laptop. In windows 10 you shall go to Settings -> Update and Security -> Recovery. Two Options Reset this PC has options like So, from the above picture if you select the third option you can get the Windows version which the your laptop has been sold/shipped. Sometimes, the above idea may break/ malfunction your laptop/PC. Try at your own risk. Better be in Windows 10. Don’t downgrade to Windows 8/8.1/7 because the driver settings may vary as you have upgraded from Windows 8/8.1/7 to Windows 10. Sometimes, the files get’s corrupted. For example Wifi Driver won’t be working if you go back to Windows 8/8.1/7. My advise is always take a free backup, check out the steps from my blog. Easy Steps!!! How to back up Windows 10 System Hope this should help you.
How to Install Windows 10 and Back It Up. How to restore System to Windows 7 or Windows 8/8.1 (Windows 10) by using the CD What does it mean when the drive letter changes and if I will need to change drive letter or format? After Windows 10 update you may have trouble with drivers. Check that you did not change your UEFI settings with this utility.