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)   Windows PC Tweaker 2012.01
All-in-one tool for optimizing your PC, Windows PC Tweaker offers complete solution for Windows users who want to tweak PC system to the optimal performance. Repair problems, clean up drive space, optimize system, apply Windows tweaks and more.

 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