Thanks,
As a beginner to hackintosh, I did format the HDD as GPT - that is what most tutorials recommand ( I have to admit, they were not designed for dual boot ) . My Dell runs windows on an NTFS partition, and ML on a GPT partition. But the bootsequence won't find the bootloader so I have to plug in the myHack USB each time I turn the machine on. Works everytime, but not very handy. This was my first shot at it and surely not the final setup. So I've got patience, time and willingness to learn more .
So i will redo everything as MBR - 2 partitions, install W7 first, then OSX then the MBR patch. I just hope I won't have to load the bootloader from an external drive.
Where can I find this patch by the way ?
Thanks