"Class Not Registered" or Error 80040154 can have a few different solutions
depending on what are you doing in WMP at the time you get it.
Q: Do you get this while trying to play an AVI?
Is so...You most likely don't have the right codec installed for that
specific AVI or you have a bad install of the codec.
Using a DirectShow decoding filter such as FFDShow will decrease the
problems you could run into with codec problems. FFDshow will decode XviD,
DivX 3/4/5, 3IVX, and has support for many other codec's. It can be
downloaded at http://tinyurl.com/2snnx. (Download ffdshow-20020617.exe and
then run it's installer)
If you just wish to install the individual codec's for your specific video
or FFDShow doesn't support the codec for you file please do the following.
- Download and use GSpot (http://tinyurl.com/328cp)
- Run the installer, open GSpot, goto File>>Open.
- Look for the 4CC code for the file's Video Codec
- http://tinyurl.com/262go will help you.
(Or post the information back here and I can help)
-If you don't get audio, what codec does it use? GSpot also tells you this.
If you have the correct codec installed and the video still doesn't play
download GSpot and run your AVI though the program. If Gspot says "Failed
to render", "Missing Chuck", etc. then your video file is corrupt.
Q: Are you playing an MPEG/MPG file?
If so...Please provide the following information in a reply to this post.
-Does it only happen with a few MPEG/MPG files?
-If so...It's most likely a file encoded with the MPEG-2 codec. To decode
this you will need to install an MPEG-2 decoder. Follow the link to more
information.
http://www.nwlink.com/~zachd/pss/pss.html#mpeg2
-If not...Can you provide a link or more information about the file?
Q: Do you get this while playing a file other than an AVI or MPEG? (Or All
File Types)
If so... http://tinyurl.com/yu649 will help you out.
Q: Are you only getting this error for specific music files that you have
downloaded?
If so...What file format and what version of WMP are you using? Please also
include where you got the file.

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> Class not registered : Error 80040154 in wmp (windows 98).
> I get this error while trying to play an MPG file.
> I think some codecs are missing but how can I know which one
> Can someone help me?
> Thanks.
> Astrid
astrid - 31 May 2004 20:41 GMT
Hi
Thanks for your help
I run the installer for GSPOT and opened the file
I got this : This is an MPEG format video file. This format is not currently supported by GSpot. Note that "Rendering" may be used to obtain more information about an unsupported format
To get more information by having GSpot instruct the O/S to "play" the file and then examine the results, press the button labeled "Render"
Then I pressed the button "RENDER" and I got this
DirectShow was unable to render the file. Following is the error it reported
0x80040218: VFW_E_CANNOT_RENDER - No combination of filters could be found to render the stream
Could you help me again, please
Thank
Astrid
Chris Lanier [MVP] - 31 May 2004 21:43 GMT
You need to read the MPG specific part of the post, not the AVI part.

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> Hi,
>
> Thanks for your help.
> I run the installer for GSPOT and opened the file.
> I got this : This is an MPEG format video file. This format is not currently supported by GSpot. Note that "Rendering" may be used to obtain
more information about an unsupported format.
> To get more information by having GSpot instruct the O/S to "play" the file and then examine the results, press the button labeled "Render".
>
[quoted text clipped - 5 lines]
> Thanks
> Astrid