Try downloading the (free) AVI codec pack from the net, see if that resolves the issue.
on a video I downloaded from my phone..but it plays audio in QuickTime. How do I either get the QuickTime version to Facebook or get audio for Windows 7 windows media? Someone told me I need to download a K something codec????? Please help...I did an adorable video of my niece and want the family to HEAR it as well as see it...thank you in advance

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic