Problems with audio, please help.

[gurner2000]

I downloaded a film in AVI format, ive managed to make copys of others after a few teething problems but got there in the end.
The first task was to extract the WAV using Virtual Dub, but i got this error

http://www.gurner.pwp.blueyonder.co.uk/untitled1.JPG

So after a quick search on here and reading through some other posts, i decided to open the AVI in goldwave and save the WAV that way, all was well, so i thought.
Then when i had my WAV and AVI i inserted both into tmpgenc and started to encode to mpeg2 using the dvd template set at CQ_65.
After 2 and a half hours i go to play the film back on the PC and audio is way out of sync, so i had a look around and downloaded Gspot and ran that to make sure i had all the correct codecs installed, and it came back telling me all was ok and i had all the neccasary codecs.
Then after reading somewhere else, i tried another AVI checker to see if it came up with any different results, and found that its telling me that i dont have the required codecs
Here is a picture of what both say, and the AVI plays back on the PC with no problems and the audio sync is fine.

http://www.gurner.pwp.blueyonder.co.uk/untitled.JPG

Can anyone help a newbie out ?

Thanks in advance

[gurner2000]

By the way ive done the way of extracting the audio in "direct stream copy" using virt dub then converted the AC3 file to WAV using AC3 encoder, as far as i know i have the full version, it doesnt say there are any restrictions, but it only encodes half the wav so i went for the goldwave option.