Backup any data,then insert the recovery disc and reboot,follow the onscreen prompts.
Then visit Microsoft and fully update the system.
Obviously you will have to reload all your programs...Av/Firewall/etc..
The Evil Within 2 review-in-progress
Photoshop CC 2018 released with new Curvature Pen and better brush tools
Camera tips to take better iPhone photos
Les meilleures applications de covoiturage 2017