Defragmentation Software, Windows

We need a software to defrag hard drives. This should be similar to e.g. the Defrag solution that is included in Windows. People should be able to select a drive and to start the defrag process and they should see some kind of status indicator (e.g. a percentage bar or even better a map of the clusters) so that they can see what happens. There are some requirements: -The Software must be safe to use and bug free. It must be usable under Windows XP and Vista. -It needs to be written in C# (.NET) -It should be written clearly with a good class structure and a separation between the logic and design so that we can change the form design easily For delivery: -We will get the source code that we can use as a base to build a commercial solution. -On delivery we will receive everything that we need to compile the software (e.g. all necessary 3rd-party libraries, etc.). For example, we might receive a ready-to-go ZIP file containing a Visual Studio project that we can compile out of the box.