Regedit -- the Registry Editor
Start Regedit: [Start > Run > type regedit > press enter > OK]
Remember: The Help file in Regedit is very (no pun intended) helpful.
Compare to Windows Explorer
Keys > Values
Export / Import
Resources:
Registry Detective -- A fast, multi-location Registry search tool (fee). You can search very rapidly and then jump directly to Regedit at the Keys you found.