System Restore : In case of system instability, it is suggested to have a restore point before your PC system undertakes any major actions. Then you can choose a restore point and return your computer to its previous stable state.
To Restore System:
button on the left side, and then click the Backup
Select the restore point you'd like to take, then click the
On the popup window, click
4. After the restore take effect, you should reboot your OS. Click [Yes] on the next windows, then you system will reboot.