JkDefragGUI is an Graphical User Interface which allows you to easily select all the features JkDefrag a freeware defragmentation tool made by Jeroen Kessels has to offer JkDefragGUI can schedule a defragmentation install JkDefrag or it 39 s screensaver but can also do some small maintenance to your computer It can be used to schedule a defragmentation of your systemfiles like pagefile and registry files