Codecs.com :: Guides : How to fix Class not registered or 80040154 error

Home
Guides
How to fix Class not registered or 80040154 error

How to fix Class not registered or 80040154 error

Last update: 25 Jun 2005 | 192066 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

In the end, you should receive a message saying that your 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!

COMMENTS

This did the trick, I had given up on using the Media player. I use it mainly to create playLists and load it to my Walkman. Thank You! ...

Rating: 5 | on 21 Sep 2011, written by: Russ

Windows automatic updates working after doing this. Thanks Much

Rating: 5 | on 20 Sep 2011, written by: Will

It didn't work for me. I downloaded some computer games and still can't open them.

Rating: 1 | on 13 Aug 2011, written by: evp

Has not worked for me,I get "windows can not find" is there anything else I can attempt ?

Rating: 1 | on 09 Aug 2011, written by: Freddy L McGuire

it didn't work at all for me, the file didn't successfully install.

Rating: 1 | on 27 Jul 2011, written by: KaTRINA

Amazing ! worked instantly ! searching for hours lol couldnt find nothing this took two seconds and worked to perfection !! thanks !!!

Rating: 5 | on 18 Jul 2011, written by: Chris

A miracle!! Wow! As others above I had frustratingly tried for weeks down many sidetracks!! It took a couple of goes but it worked. I think I wasn't leaving a space after the '...32'. For info and possibly help, maybe not related, my trouble began after I installed Nero 10 Multimedia Suite. It did not run - as with my other Multimedia players - except like 'WMV Maniac' above, for VLC . Again thanks a million. Now to try Windows Movie Maker which also had 'died' :-))

Rating: 5 | on 01 Jul 2011, written by: Laurie

You fixed it... I've spent 2 days downloading all kinds of software and codec.. and yet the fix is so simple. Thanks man!

Rating: 5 | on 23 Jun 2011, written by: Jeff

I tried and it worked. I am copying old cassette recording of grandmother and couldn't hear it. Now I can. Thanks.

Rating: 5 | on 23 Jun 2011, written by: Marilyn

It worked. thanks

Rating: 5 | on 27 May 2011, written by: user

NO. It does not work! My WMV still cannot play except for its played with VLC (VideoLAN).

Rating: 2 | on 12 May 2011, written by: WMV MANiAC

I cannot believe that the fix was so easy after I had spent a great deal of time going around in ever decreasing circles... Thank you so much for such an easy fix.

Rating: 5 | on 06 May 2011, written by: phil

I can't believe it was THAT simple! After hours of pissing about with codecs and dxdiag tests and who know's what. Brilliant thanks.

Rating: 5 | on 08 Apr 2011, written by: Steve

downloaded/installed directx, registered as directed above. still getting "class not registered".

Rating: 1 | on 23 Mar 2011, written by: scala

I got the successfully registered message but the error persists. It's the AVS DVD Player (a free version) that is now hard to find.

Rating: 3 | on 16 Mar 2011, written by: Jeff