Norton Utilities 16.0 Speed Disk: Brings together (defragments) and reorganizes (optimizes) files and data that have become scattered across your hard drive. Disk Doctor: Scans your hard drive and alerts you to problems that can cause computer errors and crash your hard drive. Registry Cleaner: Helps eliminate Windows Registry problems that can slow down your PC, trigger error messages, and cause Windows to crash. Registry Defragmenter: Removes gaps, free space, and corrupt files in your registry and compacts it to free up system memory and make your PC start up faster. Registry Restore: Makes a backup of the registry before making any repairs so you can easily undo them if necessary.