Dualboot Windows 7 & Mac OS X

Hello,

I currently have windows 7 installed on my aspire 1 I have three partioned drives on with windows 7 on it one for media and 1 that I kept so in the future I can install Mac OS X on it. Now I have tried many times to dualboot and can never get it to work. I am looking for a guide that will help me. I have windows 7 and i dont want to have to reinstall windows 7 I want to leave the other two drives (media, and Windows 7) virtually untocuhed ( I RELIEZE YOU HAVE TO PUT SOME FILES ON WINDOWS TO DUALBOOT) If anyone has a guide that would be really appreciated I will need links to all of the files except that ones that are illegal to post here ( I know where to find those).

Thank you for your help,

 

I forgot to mention I will be using a usb dvd drive not a flash drive.

 

check the partitions, all must be "PRIMARY" and for OS X, save the partition on FAT32. good luck