Mp4 video sound lost when transferred to PC

[rmgoodv]

I recorded some great movies at Paris Island; they look and sound great on my Motorola Droid Razr. I copied them on to my Windows 7 PC, and I do not get sound; No sound on WMP, RealPlayer, Quicktime, nada! I even downloaded a new CODECs pack, still no sound?? Can anyone help???