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While trying to  run Disk Defragmenter in your Windows XP, you might get this 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.” Here are a couple of solutions which can solve this issue.

First method

1. Click Start.
2. Click Run, type regedit and press Enter.
3. Locate the following sub-key: HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ explorer \ MyComputer \ DefragPath
4. Double-click on DefragPath and change the value to C:\Windows\system32\dfrg.msc %c:
5. Exit the registry, turn off and back on your computer for the changes to take effect.

Second method

1. Click Start.
2. Click Run and type %windir%\INF
3. Locate the file dfrg.inf
4. Right-click it and select Install.