Open System by clicking the Start button Picture of the Start button, clicking Control Panel, clicking System and Maintenance, and then clicking System.
In the left pane, click System Protection. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
To turn on System Protection for a hard disk, select the check box next to the disk, and then click OK.
– or –
To turn off System Protection for a hard disk, clear the check box next to the disk, and then click OK.