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1 post

Wannabe Geek

#11294 14-Jan-2007 20:06
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When I try to run defrag , which ran well until a few weeks ago, I get the following error message

MMC cannot open the file C:|WINDOWS\System32\dfrg.msc.

The file exists, What can I do to overcome this problem?

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14 posts


  #57926 15-Jan-2007 12:22
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It may be corrupt...

Try a third party defrag tool

1319 posts

Uber Geek


  #57938 15-Jan-2007 14:30
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You can try restoring it with System File Checker. Open a CMD box (Start -> Run  and type cmd into the dialog) and then do:


It may not work though.


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Uber Geek

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  #57941 15-Jan-2007 14:45
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if you type in
MMC cannot open the file C:|WINDOWS\System32\dfrg.msc
into google the first link will tell you how to remedy your problem,

might be best to wait to see if someone else recommends doing this, im not sure how much trouble you can get into if you do it wrong?

10 posts

Wannabe Geek

  #58311 18-Jan-2007 23:55
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Can you try accessing it from Computer Management Console?

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