no sound after using TPMGenc

[G2145cal]

i looked through the threads,found one that sort of resembled my problem....
i have an xvid movie,the video playback is a little jerky...i just tried using TPMGenc and did an encode to mpeg for a few minutes and stopped,previewed the new mpeg and it's a perfect video playback,BUT no audio...what do i do now?

[setarip]

1) Load the Xvid-compressed .AVI file into VirtualDub or NanDub

2) From the "File" dropdown menu, select "File Information"

3) Post (here) EVERYTHING you see (both video and audio information), or post a screen capture .jpg of the information box

I'm quite certain we'll find that the audio is in either .AC3 or VBR-.MP3 format - each of which has to be dealt with differently...