Now that you have a general understanding of what the registry’s data is used for, it’s time to get more specific. Registry data is used in five areas:
Registry data is used during setup, installation, configuration, and removal of the operating system itself, of operating system components such as Internet Information Services (IIS) or Certificate Services, and of hardware devices. Any time you see an Add/Remove Something-Or-Other Wizard, you can bet that registry data is being used.
The Windows Server 2008 kernel uses the information gathered at boot time to figure out which device drivers to load and in what order; it also stores information needed by those drivers in the registry.
Device drivers use the data written ...