Registry Replacer - This is a simple program used to do a quick Search or a Search and Replace of Strings in your Registry

http://en.wikipedia.org/wiki/Windows_Registry

Registry Replacer
http://bladesdev.com/regreplace.htm 

This is a simple program used to do a quick Search or a Search and Replace of Strings in your Registry. 

Others:

RegEditX 3.0    - Tweaks for the Windows Registry Editor (REGEDIT) 
http://www.dcsoft.com/products/regeditx/ 

Funduc Registry Toolkit 
http://www.funduc.com/registry_toolkit.htm