The Perflib subkey stores configuration data for the Windows Performance Library, which collects and organizes data for performance tools, such as System Monitor.
In addition to entries, the Perflib subkey contains a <Language-code> subkey for each spoken language you configure for Windows 2000. The <Language-code> subkey stores performance counter names and their descriptions in the specified language. The <Language-code> subkey is named for the language code for the language. For example, the counters and descriptions for the English language are stored in a subkey named 009, the language code for English (United States).
To make changes to entries in this subkey effective, restart the Remote Registry Service, or restart Windows 2000.
If you cannot display particular performance counters, check the Application Log in Event Viewer for events recorded by Perflib. When Perflib finds a disabling error in a performance counter DLL, it records an event and then sets the value of Disable Performance Counters to 1 to disable the counters.