Fix Disk Defragmenter (dfrgui.exe) Does Not Launch in Windows 7

When you start Disk Defragmenter using any of these ways in Windows 7, nothing may happen except a brief blue circle (hourglass):

  • Right-click on a hard disk drive-letter, click Properties, and click Defragment now… from the Tools tab.
  • Access Disk Defragmenter from the Start menu shortcut or Search results.
  • Run Dfrgui.exe from the Windows\System32 directory.

This happens if the Disk Defragmenter service isn’t turned on. To enable the service, use these steps:

Login to a user account with administrative privileges

1. Click Start, type Services.msc and press {ENTER}

2. Double-click Disk Defragmenter service from the list

3. Set the Start type to Manual

4. Click OK.

Try launching Disk Defragmenter now.

About the author

Ramesh Srinivasan founded back in 2005. He is passionate about Microsoft technologies and he has been a Microsoft Most Valuable Professional (MVP) for 10 consecutive years from 2003 to 2012.

3 thoughts on “Fix Disk Defragmenter (dfrgui.exe) Does Not Launch in Windows 7”

  1. I installed windows 10. Hated it. Downgraded back to 7 via security features and now dfrgui no longer works. Tried your suggestion but it still did not work. Please help.

  2. I had to read a few pages of pure bullshit to finally get to your page/site, once I found your page, everything is clear precise and concise, I have learned something good today, Thanks a lot!!!

  3. For problems launching Defrag or Task Scheduler errors:
    Probably a little late for this response. But i had the massive task errors too and could not defrag after a failed windows 10 upgrade. I followed someone’s reply above to go to the system32 folder (c:/windows/system32/tasks) and go into the tasks folder. there i
    found and killed five on the main page that were not folders, but more importantly i went into the windows sub folder (c:/windows/system32/tasks/microsoft/defrag) and killed the
    only task in it. I was able to go back into the regular defrag function and still got the error that is was a scheduled task already. I clicked the bottom left to free it from the scheduled task (not sure the exact wording on the button) on it and success! I was able to get into defrag. still need to fix all the other tasks though and not sure its safe to do so yet but i got my defrag to work.

    Hope it helps anyone in the future looking to fix this. 🙂

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