Control Set

Control Set refers to a set of registry keys in Microsoft Windows that contains configuration information used for system startup.

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What is Control Set?

Refers to a set of registry keys in Microsoft Windows NT and Windows 2000 that contains configuration information used for system startup. Control sets define certain aspects of the Windows NT boot process to allow Windows NT to boot up successfully. Up to four control set subkeys are located under the HKEY_LOCAL_MACHINE\SYSTEM registry key, including the following:

  • ControlSet001, ControlSet002, and so on, which represent backup copies of control sets that successfully started the system.
  • CurrentControlSet, which refers to the control set that was used to successfully boot the system under its current configuration. The key here is a pointer to one of the ControlSet00x registry keys.
NOTE

The Select registry key under HKEY_LOCAL_MACHINES\SYSTEM identifies which of the control set keys corresponds to the current, default, failed, and Last Known Good configurations. If the current control set can’t start the system, you can press the Spacebar when indicated during the boot process to select the last known good configuration, which is the last control set that worked for sure.