3ivx MPEG-4 audio codec? 3ivx D4 4.5 audio codec? HELP

I just downloaded 3ivx D4 4.5 now my videos are playing fine in windows media player, but now i have no sound. Can anyone help?

i cant seem to play any music on my computer....it wont read anything....did i erase something....making room on my hard disk. I miss my music!