Ok, here's the case:
I figured out to use Nerovision Express to burn the files. When I viewed them on my DVD-Recorder, the quality was horrible, so I decided to find a way to fix it. I have gotten the .flv files to Avi using a program called "FLV Extract". I then use a program called VirtualDubMod to join the Mp3 and Avi files to add audio. Then, I am supposed to use an "Mpg 2 Encoder" on that file, then burn. My only problem is the encoder, because I have searched and searched and searched for one, but nothing that is free. I would be really thankful if someone would be kind enough to get me a link or something. Thanks!
Edit: If I can do it with Nero, I don't know how, and would appriciate it if you told me how.