A slideshow in excess of 650Mb? Wow thats big!!!

First thing to do is check the format of your music, your pictures and animations

If the music is in .wav format or the pictures are in .bmp format, you may beable to convert them to files that take up less space without loss of quality, such as wma or mp3 for the music and jpeg for pictures.

Personally, powerpoint would not my program of choice for creating a slideshow, preferring Irfanview, (freeware) following the instructions here.

Beauty of this is that you need neither Irfanview or Powerpoint on any other pc that are to play the cd