regoptimizer is a powerful system optimizer for windows stability & performance
QuickPCOptimizer

quickpcoptimizer | pc speed and optimization software for windows xp/vista/7/8.
RegClean Pro

RegClean Pro fixes invalid registry entries in a few simple clicks.

speed up your pc today. get a free system scan, repair errors, make it like new.

ultrasentry is a highly advanced military-grade disk and registry cleaner.
Premium Booster

feel the power of rejuvinated windows as now your programs will run faster.
RegDoctor

fix windows registry problems to improve your system's performance.
Glary Utilities

top all-in-one utility to fix, speed up, maintain and protect your pc.
Advanced SystemCare

one-click free system tool for pc tune-up and maintenance. registry repair.