I am experiencing a problem similar to the "disappearing codecs in Windows XP" one, but with Windows 98SE.
Over the last two weeks I have searched this and a few other forums, and googled, with no answer.
Basically VirtualDub and it's variants (-Mod; -mp3freeze; etc) do not recognise any audio codecs as being present, even though they are.
The only item listed in the Audio->Compression option is <No compression (PCM)>. "Show all formats" is ticked. Video codecs ARE listed, however I cannot confirm whether ALL video codecs are listed. When running the AVIcodec program it crashes when selecting the "Codecs and filters" option.
I know that I have all the video and audio codecs that should be listed installed, as BSplayer plays correctly all divx, xvid, asf, wmv (etc! encoded files, with no problems with video or audio.
The contents the following registry keys:
only contain references to the divx and huffyuv codecs, with no empty entries (I'm not sure if this is relevant information, have included it as it was related to the Windows XP problem).
In an attempt to get all file types to play correctly I un-installed all various codec packs and individual codecs that have accumlated over the years and installed just the Kazaa-Lite Codec Pack. This worked, but introduced the VirtualDub problem - so I can play files, but not encode audio anymore.
Attempts to correct (including un-installing K-Lite pack and using Nimo, then just trying individual codecs one by one without the assistance of any "codec packs", and various combinations thereof) have failed - the damage, whatever it is, is done.
Solution: (insert here)
If anyone has experienced this, or has a solution, or just a pointer or suggestion, I'd really appreciate it!