DTweak Free is an advanced tweaker and optimizing tool especially designed for Windows Vista. You will be surprised at the speed your PC will be having after you use this software. With DTweak you can defragment disks and registers, clean registry system, tune computer performance, and optimize and increase the speed of your system without manually modifying registers or ini files. DTweak Free at the moment has a lot of features like Disk and Registry defragmenters, error scanners, and user account control tweakers. This version is the first release on CNET Download.com.