Go research FLIP4MAC to add in the capability of playing that video properly.
I have Office for Mac 2004 on a MBP intel core2duo. OSX 10.5.8
I can't get a PP that was made on a PC to play the video when in the slide show mode. I can view video fine in slide view, outline view, and normal view, but when I play the slide show all I get is the audio and a still frame.