Is there a way of "flattening" this audio in Windows Movie Maker ? I'm struggling to find one at the moment.

I do have other software such as MPEG Movie Maker and TMPGEnc but I keep getting lip-sync problems with these so I'm currently stuck with the Windows software. Is there any encoding software that will do it ? I've got SUPER and ImToo but can't find a way of flattening the audio there either.