You are the system administrator for Contoso, Ltd. The human resource director's Windows 8.1 computer crashes at login this morning. After powering off and restarting the computer, you successfully…

You are the system administrator for Contoso, Ltd. The human resource director's Windows 8.1 computer crashes at login this morning. After powering off and restarting the computer, you successfully boot it, and the human resource director is able to log in. Later in the day, the director reports that the computer is still not functioning properly. Apps are opening extremely slowly, and the computer locks up for minutes at a time. You have not taken any disaster recovery steps prior to this problem. You decide to recover the computer's operating system. You need to ensure that the recovery does not affect the human resource director's current data, personalization settings, and windows store apps. Which utility should you use?