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When I try to open Device Manager in Windows XP, the following error message appears:

MMC cannot open the file C:\WINDOWS\system32\devmgmt.msc.

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Can you check whether devmgmt.msc exists in the location mentioned in the error message? Also, when did the problem start? Have you run a virus scan on your computer? Is Windows functioning normally, other than that problem? –  Indrek May 23 '12 at 13:20
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Right click on "My Computer" in the start menu and select "manage", can you view device manager in there? –  Moab May 23 '12 at 14:36

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