How to fix Class not registered or 80040154 error

Last update: 25 Jun 2005 | 295330 views | Comments: 51

"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.

Report it!
on 15 Dec 2016, written by: Unnamed # 5

worked on a windows xp professional.

on 01 Sep 2016, written by: xitiz # 4

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

on 02 Sep 2015, written by: Ryan Middleton # 3

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."

on 03 May 2015, written by: Aviral # 2

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

on 05 Mar 2014, written by: Luna Lovegood # 1

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???

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