what i'do is the following: run bootcamp assistant and create an extra partition. (make it big enough for the 2 OS's). then run the linux installer, split up t

what i'do is the following: run bootcamp assistant and create an extra partition. (make it big enough for the 2 OS's). then run the linux installer, split up the free partition, in any way you like). Install linux on it. Then run de windows installer using the leftover partition. i also suggest to install rEfit so that you can fix your guid partition table to be able to select each OS at startup.