These presentations are written in MS Producer and for optimal viewing requires a Cable or DSL connection along with Microsoft Explorer and Microsoft Media Player.  Do not rush the downloading.  If the playback freezes just wait, the program is buffering and will resume playing.  If it does not, hit the play button after a minute has passed.  If you have a 56k modem be sure to select the correct viewing option and you may have to wait up to one minute or a little longer.