Defrag is an important tool in Windows XP. With Defrag tool, you can re-arrange your fragmented hard drive. I always use it every weeks to ensure my hard drive is keeping arranged. Usually, my way to using defrag is right click my hard drive icon inside My Computer, click Tools tab and then click Defragment Now… button. But suddenly, it didn’t work today, when I click Defragment Now… button, the Defrag application didn’t show up. But I’ve been repaired it, and here is the way.

1. Click Start -> Run menu, enter %SYSTEMROOT%\Inf in box and then press Enter key.

2. Find dfrg.inf file.

3. Right click it and then click Install menu.

4. Wait for a moment and then retry to open your hard drive properties again, click Tools tab and then click Defragment Now… button.