The application from Systweak contains a plethora of tools (around twenty-five) in a single user interface. In addition to cleaning and repairing errors in the Windows Vista registry, it offers a disk cleanup tool to remove unneeded files and save space. It also defragments the Vista registry thereby optimizing it for speed. It also includes other features like disk defragmentation, data encryption and privacy protection, as well as several tweaks that allow for faster shutdowns and booting.
AVO is free to use for a month, and should you wish to use it further, you can purchase it at around $35. For a person who would like to use a single piece of software for most of his/her computer maintenance and tweaking tasks, it's a decent deal.