HKEY_USERS contains all actively loaded user profiles. HKEY_USERS has at least two subkeys: .DEFAULT and the Security ID string for the user who is currently logged on. The information in the .DEFAULT subkey is used to create the user profile for a user who logs on without a personal user profile.
The .DEFAULT subtree contains the Console, Control Panel, Environment, Keyboard Layout, Program Groups, and Software subkeys as described in Table 10.7. For details about the contents of subkeys in HKEY_USERS, see "Registry Entries for User Preferences" in Chapter 14, "Registry Value Entries."
To delete profiles from a computer, choose the Delete User Profiles command from the Options menu in Windows NT Setup.