Encoding my video in h.264 the audio is echoey.

Hello.

     This is my first time ever posing a question but I just can not figure out what is going on.

     I have 120 hours of family videos I have captured and am planning on giving them out for Christmas.  I figured that H.264 is recommended by a lot of people so I would use that.  When I encoded the video though the sound sounds super weird vs. what it does in lets say exporting it in a .wmv or .mov.  I know that those use a lossless audio format and that may be the problem, but I thought that AAC would not be that bad.  Now I could encode them all in the .wmv and .mov formats to distribute but if anyone has the answer, I think it would be great to have just one working format that will play on their PC's and Mac's.

     Is there a fix I have not learned about?

Thanks!

-Chris