... opening, 297Disable Driver Signature Enforcement option, 291disabling devices, 302Disk Defragmenter, 91, 309disk errors, checking for, 313–315display, customizing, 50–52display settings, ... 297Disable Driver Signature Enforcement option, 291disabling devices, 302Disk Defragmenter, 91, 309disk errors, checking for, 313–314display, customizing, 50–52display settings, checking and ... 297diagnostic startup, 258–259disabling devices, 302Disk Defragmenter, 91disk errors, checking for, 313–314display, customizing, 50–52Display Properties utility, 50display settings, checking...