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How to fix Class not registered or 80040154 error

Last update: 25 Jun 2005 | 247578 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
4
on 01 Sep 2016, written by: xitiz # 5

i found class not registered in attendance management software. I format and installed a new software but again same problem is detected what can I do plz help me

5
on 02 Sep 2015, written by: Ryan Middleton # 4

Windows 10 error message:
"The module "quartz.dll" was loaded but the call to DllRegisterServer failed with error code 0x80070005.

For more information about this problem, search online using the error code as a search term."

2
on 03 May 2015, written by: Aviral # 3

It didn't fix my problem but gave a error message as everyone else who have commented.I use windows 7 ultimate

3
on 05 Mar 2014, written by: Luna Lovegood # 2

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 # 1

didn't work on win 7

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