I have certainly used the TweakXP utility that provides lot of tweaking options for the XP operating system but since it was limited to the XP OS only, I have stopped using it with the advent of Windows 7.
Another such but more interesting utility is the Tweak Me which also provides lots of tweaking options in your OS whether it is a small tweak or some big tweak, you can easily use this tool. The biggest advantage of using this tool is that it automatically detects the OS you are using and provides only those tweaking options that your operating system can support.
Tweak Me has a modern user friendly GUI which makes it extremely easy for you to manage the most important tweaks which save you a lot of time when setting up Windows. To make it easier for inexperienced user to enhance their system’s performance, Tweak Me shows the tweaks in different colors (green, orange, red) to show you whether a tweak is recommended or should only be applied by people who know what they are doing.
Tweaking can greatly increase your machine’s performance but you should also keep Windows clean. Tweak Me got its own Cleaner which helps you clean up your system with just one click.