Windows has a hundred options you can configure to tailor it around your needs and taste. The only problem is knowing where to find them.
SysTuner makes things a bit easier for you by providing you with all those configuration and customization settings, organized classified under different categories, all under the same interface.
All tweaks are displayed on the left side of SysTuner's interface, in a tree-like structure. All you have to do is browse this structure and select the one you want to apply.
SysTuner includes a separate section with modules for specific tasks, though many of them are only available for Windows 95, 98 and Me, so I'm not sure if they're that useful anymore. Also, you'll find a Wizards section that's intended to make the program easier to use for the computer-challenged. However, the wizard's design should definitely be redesigned and made more usable.
With SysTuner you can easily find all those hidden configuration tweaks in Windows and customize your system in just a few clicks.