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Fix for Error “the Disk Defragmenter Is Not Installed on Your Computer” In Windows XP

© Ramesh Srinivasan | Windows XP | 9th December 2008

When you attempt to run Disk Defragmenter using the property sheet of a hard disk drive, the following error may occur. We saw how to fix the Disk Defragmenter error using the registry editor in Windows Vista. Here are the instructions for Windows XP systems.

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.

Use one of these methods to solve the problem.

Method 1: Fixing the Defrag Path in the Registry

Click Start, type regedit.exe and press ENTER

Navigate to the following location:

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ explorer \ MyComputer \ DefragPath

Double-click (default) and set its value data to:

C:\Windows\system32\dfrg.msc %c:

Exit the Registry Editor.

Registry Fix

To automate the above, download dfrgfix_xp.zip, unzip and run the file dfrgfix_xp.reg.

Method 2: Reinstalling the Disk Defragmenter

1. Click Start, Run and type %windir%\INF

2. Locate the file dfrg.inf, right-click and choose Install

Note: There will be two files namely dfrg.inf and dfrg.pnf. You’ll need to right-click on the INF file (identified by a text pad and gear icon in it) and choose Install. Note that the .INF suffix is not shown in Windows Explorer unless the Hide extensions for known file types setting is disabled in Control Panel / Folder Options / View tab.

This reinstalls the Disk Defragmenter.

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9 Responses to “Fix for Error “the Disk Defragmenter Is Not Installed on Your Computer” In Windows XP” Subscribe to comments!

  1. Optimus
    said this on Thursday, November 12th 2009 3:52 pm

    Thank you very much. After waste my time on a number of solutions this did the trick.

  2. YRey
    said this on Monday, October 26th 2009 11:18 pm

    Did not work for me either… I tried both methods. I get “Access is denied” message. Can anybody help?

  3. Brenda
    said this on Thursday, April 16th 2009 9:59 pm

    the methods are not working for me, what else can I do short of re-image?

  4. smoke888
    said this on Wednesday, April 15th 2009 7:03 pm

    thank you this worked perfect, very much appreciated.

  5. Aman
    said this on Monday, March 23rd 2009 11:47 am

    i have also tried the both methods but problem is remain same

  6. Kid Brusko
    said this on Sunday, February 15th 2009 1:20 pm

    With the two methods, the problem still persists…quite annoying…i guess this was caused by an attack of a worm or similar crap in my pc recently…any alternate solutions? thanks!

  7. Paul Bartomioli
    said this on Sunday, January 25th 2009 9:35 pm

    I had the same results. “Disk Defragmenter is not installed on your computer.”

  8. Marco
    said this on Wednesday, January 21st 2009 6:38 am

    I have tried both Methods and neither of the two was able to fix my problem….

  9. Deyaa Addeen Fahmy Shedeed
    said this on Wednesday, December 10th 2008 4:59 pm

    thank you very much.

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