Tweak a Myriad of Windows Vista Features and Enhance its Performance. With DTweak you can - defragment disks and registers, - clean file and registry sistems, - tune computer performance, - monitor hard drives health and performance - native 64 bit support for best 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!