I'm trying to get the audio and visual into a single file that I can play in Windows media player. I have a 6-minute .avi video file, and the accompanying .mp3 or .wav sound file.

How can I get the audio and visual to play TOGETHER, and ensure that the video and sound match up WITHOUT LAG of the video or audio? I want video and audio to be in -synch without lag or delay.

contraints:
I need great visual quality (hence the .avi file)


DETAILED INSTRUCTIONS PLEASE!!
HELP!!!!!!!!!!!!!!!!!!! HELP!!!!!!