"Action Canceled" error while opening Device Manager.

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.)

by Ramesh Srinivasan.