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)   PCPal 1.0.1026
PCPal is a free easy-to-use tool that notifies you about problems in your PC and helps you fix them. PCPal helps you detect and resolve issues in a wide range of categories, such as security, performance, network and printing

 3)   Systerac Tools for Vista Beta 4.00
An incredible package of tools for Windows 7, Windows Vista and Windows XP that will improve your PC performance, speed up your programs and Internet connection, diagnose pc problems and tweak your Vista PC for optimal results.

 4)   Infibia Easy Tools for Vista 1.24
Infibia Easy Tools for Windows 7 helps keep your PC optimized and running at top efficiency and speed while making your life easier. The program identifies problems and repairs your Windows 7 by itself! No learning curve! High ease of use!