A reliable registry cleaner from "Marcos Velasco Security" is MV RegClean
released recently to version 5.0 - freeware
This application is a trusty and non-aggressive Registry Cleaner.
With a friendly user interface, can be used through command line, this will allow to use MV RegClean through a batch file or scheduling a task. When MV RegClean is ran through command line, it does all the cleaning without user interference, with the security backup.
Operating Systems: Win Vista (32/64 bits) - Win XP - Win 2003 - Win 2000 Pro- Win ME - Win 98
Enjoy the use of it.