MAC air program installation

ExiaX

I recently bought a mac air, but i forgot to deal with the disk problem. i completely forgot that since the laptop is so thin, there is no way possible there is a CD drive installed. SO HOW DO I INSTALL PROGRAMS FROM DISK? i feel 7 lol...  is there any other way then using super drive? cause i dont want to buy a super drive jsut for the air. and i dont have any other external hard drives. although i do have a PC