Going back to Windows 7 or Windows 8.1

You can go back to your previous version of Windows by going to  Settings > Update & security > Recovery  and selecting either Go back to Windows 7 or Go back to Windows 8.1. 

This won't affect your personal files, but it will remove any apps you installed after the upgrade to Windows 10.

Everything You Need to Disable in Windows 10 !!!

Please check the following link...

http://windows.wonderhowto.com/how-to/everything-you-need-disable-windows-10-0163552/