When you copy files and install software, the new files do not go exactly where you would want to on the hard drive, and I'm talking about the destination folder. On the hard drive itself, files are written in a scattered manner, slowing down the disk over time. You require a cleaner tool to help you out in this case, and MyDefrag is one of the best.
It will clean up the problems on the hard drive by performing defragmentation on the partitions. These are automatic processes which can be easily launched from the software within a few mouse clicks, allowing you to speed up your PC easily.