You can use the Disk Defragmenter to re-arrange files and unused space on your hard drive, so that programs run faster. There has been one addition to this accessory since Windows 95. This is the inclusion of a Settings button. You can decide whether to rearrange program files so that programs start faster and/or to check the drive for errors. You can also set these options to apply just for this session, or to be used every time you defragment a drive. That small insignificant tick box for de-fragmenting program files in order to load programs faster is actually one of the most significant enhancements made to Windows. Disk Defragmenter takes a log file from a program called Taskmon.exe which tells it which files are needed by which programs so they can be placed sequentially on the hard drive. Then, when the program is loaded, the system does not have to waste time seeking files from different places on the disk, but can load them in one long straight read, hence accelerating the load. See also Accelerated Application Launch