Registrar Lite for WinXP/2000/NT/ME/9x is a freeware powerful registry
editor. It offers an explorer style interface which supports the
clipboard and allows you to drag drop registry keys and values.
It offers fast background search and replace, a bookmark editor which
allows you to add descriptions to registry keys as well as advanced
registry value data editors.
Import and export of all native registry file types are supported.

When running on WinXP/2000/NT Registrar Lite offers security editors
which allow you to set registry key permissions, auditing and ownership.

Registrar Lite is the freeware version of the advanced registry manager

called Resplendent Registrar.