Boot Camp Assistant installing Windows 7 option is grayed out. Help!

I have a late 2009 27" iMac, to which i clean installed the Yosemite OS (been updating the OS since Snow leopard that came with). I had Widows 7 installed since i bought it, but now whit this clean update the Boot Camp Assistant shows the option to "Install or remove Windows 7 or later version" grayed out and I'm unable to select it at all.
So far I've tried downloading the windows drivers from the Boot Camp Assistant to a DOS formatted flash drive, downloading them from the apple support page and also some files (also from apple) specific to my computer. Non of which have any file or program to instal or run to alleviate this problem.
As I see it, there may be one of two things causing the problem.
First: I saw somewhere on the apple support page that do to the model on my computer I need Boot Camp 4 and I have Boot Camp Assistant 5.1.2 (Maybe if I could instal this older version, but how?)
Second: When I clean install the OS I partitioned the disk into 3 parts, (system, Windows, and Projects) and that may conflict whit Boot Camp Assistant somehow?
Please Help Me

Anubis87 wrote:
Second: When I clean install the OS I partitioned the disk into 3 parts, (system, Windows, and Projects) and that may conflict whit Boot Camp Assistant somehow?
Please post the output of the following commands.
diskutil list
diskutil cs list
sudo gpt -vv -r show /dev/disk0
sudo fdisk /dev/disk0
The last two commands will prompt for your password. These are run from OSX Terminal.
Your current disk layout is unsupported. The standard layout is EFI/ESP, OSX, Recovery HD, Windows. Every software upgrade is a problem waiting to happen in your current configuration. Snow Leopard (without a Recovery HD) is the last OS which can support an additional 'shared' partition. Once Recovery HD came into the picture, this ability was lost.

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