Free disk defragment and optimize utility for Windows 2000/2003/XP/Vista/X64. Completely automatic and very easy to use, fast, low overhead, with several optimization strategies, and can handle floppies and USB disks/sticks.
Included are a Windows version, a commandline version (for scheduling by the task scheduler or for use from administrator scripts), a screensaver version, a DLL library (for use from programming languages), and versions for Windows X64.

What's New in JkDefrag 3.36 :
· Reverted back to an old Microsoft Screensaver library. The 2008 compiler has a library that is incompatible with Windows XP ("The procedure entry point ChangeWindowMessageFilter could not be located in the dynamic link library USER32.dll").
· Fixed a problem with extremely long path names.

What's New in JkDefrag GUI 1.03 :
· Added JkDefrag.exe and other files to the archive, request of Jeroen Kessels
· Added a question to download JkDefrag when it isn't found in the program folder otherwise quit
· Added check to see if CCleaner is installed on local computer and update JkDefragGUI with this version
· Added Ukrainian translation
· Added Turkish translation
· Added /s to commandline this will autoselect "Shutdown after defrag" in the GUI
· Added /r to commandline this will automaticly run JkDefrag with saved options
· Added /rs to commandline this will automaticly run JkDefrag with saved options and shutdown afterwards
· Changed location of logfile when saved in the same folder as the GUI for U3 Devices to U3 Documents
· Created a new icon for JkDefragGUI
· Embedded background image into the executable
· Fixed bug Installer not working 100% when JkDefragGUI.exe is renamed
· Improved internal cleaner reading settings from all existing profiles
· Improved support CCleaner, internal cleaner can control CCleaner settings
· Improved deleting folders IECache and History current user, will not leave empty folders anymore
· JkDefragGUI not packed with UPX anymore to reduce the amount of false positives by virusscanning software
· Logfiles are saved with date and time in name and can be read from within the GUI
· Logfiles can be deleted from within the GUI
· Updated Uninstaller, a registry value was left behind