MMC cannot open the file C:\Windows\system32\dfrg.msc. The problem is whenever he tries to run the Disk Defragmenter shortcut from Start > Programs > Accessories > System Tools > Disk Defragmenter, only an error window appears:
The purpose is to optimize the time it takes to read and write files to/from the disk by minimizing head travel time and maximizing the transfer rate.
Windows Disk Defragmenter is a computer program included in Microsoft Windows designed to increase access speed (and sometimes increase the amount of usable space) by rearranging files stored on a disk to occupy contiguous storage locations, or defragmenting. One of my client’s computer encountered a problem which is unable to run Windows Disk Defragmenter.