Advanced Registry Optimizer™ is an award winning Windows utility that helps maintain the integrity of your Windows Registry by scanning for and fixing invalid registry entries.
Windows Tools
Visit Paretologic 
Trial/Demo Version available 
Buy Software ($29.95) 
Download Trial Version (1.40Mb)
RegCure Registry Cleaner & Optimizer 1.5.0.0 seeks out those remnants left behind on your registry from failed installations, incomplete un-installations, disabled drivers, and spyware applications.
Spotmau PowerSuite Home Edition 2008 includes many useful tools for your PC like Windows Recovery, Windows Doctor, Password & Key Finder, Windows Password Recovery …
Spotmau PowerSuite Professional 2008 : use it to boot up any computer; fix and install Windows; optimize and speed up your system; clean up history and protect your privacy, …
With Spotmau Clone Genius you backup the entire system including Windows, programs, files and personal settings, so that you can restore them in the event of a system crash.
With Registry Mechanic 8.0 you can safely clean, repair and optimize the Windows registry with just a few simple mouse clicks.
Visit SpyNoMore Shareware / Downloadable Trial Version Buy Software ($39.95) Download Trial Version (2.92Mb)
SpyNoMore 2.67 scans, cleans and blocks spyware as well as any other good anti-spyware product, but with one big advantage, Custom Fix (patent pending).