HKLM\SYSTEM\CurrentControlSet\Control Registry Tree

The HKLM\SYSTEM\CurrentControlSet\Control registry tree contains information for controlling system startup and some aspects of device configuration. The following subkeys are of particular interest:

Class
Contains information about the device setup classes on the system. There is a subkey for each class that is named using the GUID of the setup class. Each subkey contains information about a setup class, such as the class installer (if there is one), registered class upper-filter drivers, and registered class lower-filter drivers.

CoDeviceInstallers
Contains information about the class-specific co-installers that are registered on the system.

DeviceClasses
Contains information about the device interfaces on the system. There is a subkey for each device interface class.