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Defragmenter Doesn't Work In Windows Vista/7

In Windows Vista and above, opening the Defrag application from Explorer doesn't do anything. If running defrag from the command-line, the program displays its banner but otherwise doesn't do anything.

This may occur if defragsvc.dll is unregistered.

To resolve:

  1. Click Start , type CMD in the search box and press Ctrl-Shift-Enter to invoke a command prompt in elevated mode:

  2. Type:

    regsvr32 defragsvc.dll

    The system should display “DllRegisterServer in defragsvc.dll succeeded”.

  3. Close the command prompt.

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