In the AviC thing change them so they match. Either DivX or Xvid... thing is i don't know which one it should be using so you're going to have to switch between the two.

But before that... important thing to do.

Your file should only have one extension. .avi and not .avi.avi
This means none of the files will run straight off your DVD/CD because the extensions are all screwed up. And unless it's a DVD re-writer you're using with a rewritable DVD you can't change that.

So try copying and pasting one of the files to your HardDrive, then opening the command prompt and type in "Rename " without the speech marks, but with the space at the end. Then drag the file into the command prompt and type some random name in with just one extension. EG: anything.avi
Then press return. Then rename the file in windows to whatever it should say, but DO NOT put .avi on the end of it. Ok, now play the file. If it dosn't play, open AviC and switch it to the other codec (if it's on DivX by default, switch both to Xvid. If it's Xvid by default then switch them both to DivX.).

Gspot is a codec application. It has a database of codecs and it diagnoses your files and tells you if you have a codec problem. It can be downloaded Here.