1)   Go Registry Mechanic 5.2
Safely clean, repair and optimize the Windows registry with a few simple mouse clicks! Problems with the Windows registry are a common cause of Windows crashes, slow performance and error messages. Make your system more stable.Improve the performance

 2)   WinASO Registry Optimizer 4.0.5
Speed-up your System. WinASO Registry Optimizer repairs Windows registry problems with a few mouse clicks. Scanning and clearing the history of the use of programs and applications in your system

 3)   RealCare 2.10
RealCare does everything possible toclean Registry,remove junk, protect privacy, eliminate spyware, prevent threat. keeps your computer safe, error-free and running at top speed. It makes your computer faster, safer, and much more efficient.

 4)   Registry Optimizer 2007 3.0.0
Registry Optimizer 2007 prevents errors and repairs pc problems. Is your computer moving too slowly ? Do you receive strange messages about errors and want to stop this from happening again? Too much sudden computer crashing is affecting you too?

 5)   WinASO EasyTweak 2.00
WinASO EasyTweak is one of stronger and more powerful computer system optimization tools.