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"Action Canceled" error while opening Device Manager

Published: Feb 28, 2005
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Symptom

When you open the Device Manager in your Windows XP computer, the "Action cancelled" screen may appear showing 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 if the module dmocx.dll is missing or not registered correctly. To fix the problem, type this command in Start, Run dialog:

regsvr32 c:\windows\system32\dmocx.dll

You should see the message DllRegisterServer in dmocx.dll succeeded after running the command. In case the module is missing from the system and you get the following error:

LoadLibrary("dmocx.dll") failed - The specified module could not be found.

You need to extract a copy of the file dmocx.dll from the Windows XP CD-ROM or from the ServicePackFiles folder, which ever has the latest version of the file. To extract a copy of the file from the Windows XP CD, use these steps:

Click Start, Run and type CMD.EXE

Type this command:

expand X:\i386\dmocx.dl_ -r c:\windows\system32

Where X:\ is your CD-ROM drive letter. The above command assumes Windows is installed in C:\ drive. If not, change the drive letter accordingly.

After extracting the file, register the file using the regsvr32 command (as mentioned above.)