How to restore win7/8.1 system after win10 system upgrade

After the launch of the ghost win10 system, many users can't wait to choose the upgrade. Although the official version of win10 has been tested and user experience feedback for ten months, as a new operating system, many users will inevitably encounter various problems during use. For example, program compatibility issues, win10 hardware power consumption and upgrade version restrictions, etc., but let more users upgrade win10 and want to restore to the original win7/8.1 system, then upgrade win10 system back cover how to downgrade?
1 Open the "Settings" interface in the win10 system, and then select the "Update and Security" option, as shown in the following figure:

2, select "<quo> ; Roll back to Windows 7 & rdquo; and start.

Tips: After upgrading to win10 system, this option can only be used for one month after rolling back to windiws7 system.
Microsoft also considers that users experience unsatisfactory or various problems in win10, and also incorporates the "recovery" function. If the user is not satisfied with the upgrade, they can follow the tutorial method to fall back to the original. operating system.