Hey, I'm new to these forums, sorry if this is posted in the wrong forum.

My problem is I'm trying to edited files recorded of xbox 360 gameplay with my new capture card (Dazzle Pinnacle Video Transfer). The exported file format is MPEG4 and I don't think I can change this. Anyway, when I go to edit the MPEG4 files (using Windows Movie Maker because my vegas trial ran out), I find that splitting a clip in half mutes the audio in both splitted clips. I don't understand why this is happening but its quite annoying that I don't know how to fix this problem and I don't know another way around it.

Please could you help me solve this problem?
Thanks in advance.