sri
Moderator

Joined: 28 Jan 2006
Posts: 381
Location: Hyderabad , India

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"Action Canceled" error while opening Device Manag
When you open Device Manager (devmgmt.msc), you may encounter an error message Action Cancelled with the following details:
Internet Explorer was unable to link to the Web page you requested. The page might be temporarily unavailable.
Resolution
This is caused due to missing CTreeView Control - {CD6C7868-5864-11D0-ABF0-0020AF6B0B7A} registration information is missing.
To fix the problem, type this command in Start, Run dialog:
regsvr32 dmocx.dll
If the dmocx.dll file is missing, extract a copy from Windows XP CD-ROM or the ServicePackFiles folder.
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