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undoing changes
data-recovery software for, 437
for stability, 220
uninstalling
applications, 212–213, 213
devices, 150–151, 150
in troubleshooting, 143–144
uninterruptible power supplies (UPSs), 276, 276
types of, 277
warranties for, 277, 458
Universal Serial Bus (USB) ports and devices
advantages of, 43
hard drives, 39
keyboards, 171
for performance, 307–308
purpose of, 44
Unknown Devices, 234–237, 235–236
unstable software, damage from, 318
updating
devices, 151
network drivers, 362
virus-scanning software, 85
Windows Update for
removing, 224, 225
for stabilizing operating systems, 221–222
turning off, 222–223, 224
upgrades, 3, 192
BIOS, 194–195
operation of, 195–197, 196
problems in, 197–198, 198, 208
removing, 198
memory, 199
installing, 199–200
memory types in, 202–204, 203–204
rearranging, 201–202
troubleshooting, 200–204, 203–204
motherboard, 204–206
operating system, 206–207
performance expectations for, 290
problems in, 207–209
risk limiting in, 192
UPSs (uninterruptible power supplies), 276
types of, 277
warranties for, 277, 458
USB (Universal Serial Bus) ports and devices
advantages of, 43
hard drives, 39
keyboards, 171
for performance, 307–308
purpose of, 44
User Accounts window, 78–79, 78–79
user-input devices
connections for, 41, 42
disasters related to, 42–43
utilities
compatibility of, 65
damage from, 317–319
for PC recovery resource kits, 105–106
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