Putting Games On Kazaa

hi

i want to put some ps2 and dreamcast games on kazaa (almost 200 games :D ) but due to my shyte ISP my upload is capped at 128k (about 15kbps) and when i use winISO and make an ISO with the game they all come out at like 700mb even for crappy small old games like tetris for the dreamcast. How come i saw about 20 dreamcast games all around 40mb yet mine come out at around 700mb can sombody please tell me how to get them smaller please??

Thanks :)