A properly tweaked system is must for optimal PC performance and Windows utility System Nucleus is another great freeware to achieve this. The powerful system utility suite comes with fairly advanced features to view, edit and manage system resources and settings, the consolidated functionality set is designed to make these tasks easier than ever from a single interface. Developer of System Nucleus has put emphasis on batch processing, filtering, and easy visual identification of items using distinctive icons.
Equipped with modules like System Audit, System Editor, Startup Manager, Backup & Recovery, Windows Application Menu, System Tray Menu, Program Manager, Disks & Drives, Detailed Information, Smart Run and Customizable SetOnce Interface makes it a comprehensive toolbox to tweak your computer, the utility is designed to make batch administration operations easy like kill multiple processes, uninstall multiple applications etc.
A major update to the 
Technology has always came to rescue when needed, and if you want to fix your low-resolution, poor quality videos - patented video enhancement technology “super-resolution" is now here for your help.
MyGreenPC is an unique service built upon Windows integrated technology for providing a remote desktop solution that is easy to setup, more secure, saves energy, and is accessible from anywhere in the world, users can start sharing their desktops securely in 2-3 minutes - literally!
Kaspersky is giving away 
Another popular jailbreaking utility for Windows 
