codec for all OS

[test]

greetings,

i am doing a school project and i need to create a video which can be played on all OS.
i would also like to know if it possible to create a menu so that when the cd is inserted that it automaticly check's if the codec is available or not, and if not that it automaticly install the codec
i have 2 days for this project so help would be lot apriciated
what is the easy way to this

summary:
codec supported by all OS
and when the cd is inserted it automaticly check if the codes is installed

thank you all in advance

[atifsh]

a simple mpeg1 file will play on all OS's and all computers, no codec required.
MPEG1 can be a VCD = 1150 max bitrate, or a simple mpeg1 file with max bitrate of round 6000.

anything else require codecs and for auto checking cd u need some kinda coding that i have no clue of....

[tigerman8u]

I would check VLC (videolan) free, uses it's own codecs and plays most any type of video.