DTweak Free is a free advanced tweaker and optimizing tool especialy designed for Windows Vista. With DTweak you can - defragment disks and registers, - clean registry sistem, - tune computer performance, - optimize and increase the speed of your Windows Vista system without manually modifying registers or ini files. DTweak at the moment has a lot of features like Disk and Registry defragmenters, error scaners, user account control tweakers etc - for more information see Features section. Anyway - we continue adding new features with every new release, and if you didn't see a needed feature in this release you'll see it in the next!