1)   Systerac XP Tools 4.03
Systerac XP Tools are an amateur and professional's tool for optimizing windows xp performance, identify problems and bottlenecks and make sure that your PC is running at top efficiency and speed. Tweak your XP for optimal results.

 2)   Advanced PC Tweaker (tweak Windows PC) 3.6.2
Advanced PC Tweaker is a solution for Windows users who wish to tweak the PC system to the optimal performance; with the built-in powerful components, allowing you repair problems, clean up drive space, manage backups, optimize system.

 3)   new 5.2
Gives you direct access to many frequently-required settings and parameters, enabling you to make your operating system behave the way you want. Tweaker also includes many settings that cannot be accessed in Windows at all