TweakNow PowerPack is a fully-integrated freeware suite of utilities that let you fine-tune every aspect of your computer’s Windows operating system and Web browser.

The Registry Cleaner module provides you with a  simple way to clean Windows Registry.

For Windows tweaking enthusiasts, the suite provides more than 100 hidden Windows settings in the Windows Secret section.

The Virtual Desktop module lets you run as many as four custom-designed desktop configurations simultaneously, allowing you to tailor your computer screen to your mood and your work requirements.

The suite also gives you a complete picture of all aspects of your computer’s hardware, including detailed information about your motherboard, processor, video card, memory, hard disk and network.

Its other modules include Disk Cleaner, Disk Usage Analyzer, Miscellaneous Tools,Registry Cleaner, Registry Defragmenter, Startup Manager,  System Information, Track Cleaner, Uninstall Program, Windows Secret &  Restore Backup.

You can also password protect the app to prevent its unauthorized use.

It is no longer free. Have a look at these free Windows Optimizers and Ultimate Windows Tweaker.

Works on Windows 7, Windows Vista & Windows XP.