When you attempt to Analyze or Defragment, Disk Defragmenter doesn't do anything. When you try Defrag.exe from a CMD.EXE window, or batch, you receive a Windows cannot connect to the Disk Defragmenter engine error message. When you right-click a local hard disk and press Properties, the Defragment Now button is not available on the Tools tab, or it is available, pressing it displays the following error:

The Disk Defragmenter is not installed on your computer. To install it, double-click the Add or Remove Programs icon in Control Panel, click the Install/Uninstall tab, and then follow the instructions on your screen.

This behavior will occur if the Disk Defragmenter is not installed.

To install the Disk Defragmenter:

1. Start / Run / %SystemRoot%\INF / OK.

2. Right-click the DFRG.INF file and press Install.