"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.

Wow, worked like a charm in seconds...after hours of research and trying other suggestions to fix this problem, THANK YOU!!!

Rating: 5 | on 30 Jan 2012, written by: Angie

I came across this when I was trying to find a solution to my problem. It looks like some of the people responding are merging regsvr32 and quartz.dll and mispelling regsvr32. There is a space between regsvr32 and quartz.dll. Regsvr32 is an exe that registers dll's. Hope this helps might not help the people that posted because they might have found other help but maybe the next individual that reads. If not, I tried :)

Rating: 3 | on 13 Jan 2012, written by: Daisy

It did gave me quartz.dll succeeded but still am facing the same problem. What next???

Rating: 2 | on 09 Jan 2012, written by: Ahmed Khan

Did not help. I just downloaded newest version of Movie Maker and updates, latest Direct X, ran registry tools, etc. Everything else is just fine, but cannot download from Sony HandyCam MiniDV without this error. Thanks for trying.

Rating: 2 | on 05 Dec 2011, written by: Henry J Powsner

Not much of a Windows fan...it is stuff like this, unexplained errors, that drives me nuts. Even less of a MAC fan, though. Thank you for your help. I can hear my airhorn sfx now.

Rating: 5 | on 20 Nov 2011, written by: Beeber

TRIED THE SUGGESTION BUT THEN ENCOUNTERED ANOTHER CODE ERROR. STILL HAVE NOT RESOLVED THE PROBLEM. THANKS FOR THE HELP ATTEMPT ANYWAY

Rating: 2 | on 24 Oct 2011, written by: Nick

Not worked cannot find regsv32quartz.dll ,,, loads of solutions out there,,, no answers

Rating: 5 | on 11 Oct 2011, written by: Chris

did not work message saying "cannot find regsv32quartz.dll"

Rating: 5 | on 25 Sep 2011, written by: davie mccartney

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

How to install/uninstall DLL and AX codec files

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