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How to fix Class not registered or 80040154 error

Last update: 25 Jun 2005 | 210206 views

"Class not registered" is one of the most annoying and frustrating error message I ever got because none of the video files can be played by Windows Media Player, Media Player Classic or other DirectShow player and common fix methods (Windows Media Player reinstallation/upgrade, codec reinstallation...) seems to fail.
Fortunately, the solution (in fact one of them because there are few different solutions) for this problem is very simple.

After some research I found that quartz.dll (a DirectX related DLL) wasn't registered correctly.


How to register it? Click on Start > Run... > and type regsvr32 quartz.dll
 

Run dialog box





In the end, you should receive a message saying that your file was succesfully installed.
 

The file was succesfully installed





Note: Please, let us know if the solution suggested here wasn't helpful for you so we can try to complete this guide with other hints.

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COMMENTS
3
on 05 Mar 2014, written by: Luna Lovegood # 5

This didn't work for me because I still get an error message that says: "Quartz DLL was loaded but call to DLL Register Server failed with error code 0x80070005. Now what???

1
on 25 Jan 2014, written by: racher # 4

didn't work on win 7

3
on 08 Dec 2013, written by: Kevin # 3

The opening paragraph said there were several easy fixes. Only one was given.

I did the recommended fix successfully, but that did not remedy the problem. What other commands can I run to try to fix this? Thank you.

2
on 15 Jul 2013, written by: Pcmaven1 # 2

Class not registerd when I try to save-as in MS Word or Open Office. Your fix had no effect, but got confirmation register server succeeded.

Rebooted, my problem not solved.

5
on 26 Jun 2013, written by: kenny # 1

i get the class not registered error when i right click on a file trying to "open location" will this work for that instance?"

i do not get this error using media,or i haven't yet" sorry for being a luddite. i didn't want to try first messig something else up....

thanks...
kenny win 7 64it

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