Q: windows cannot be instaled to this disk

Your Mac model supports two different methods of installing Windows.

1. What is the version of Windows?

2. Are you using BC Assistant?

For W7 64-bit, you have only one method. BC Assistant is Bootcamp Assistant in Applications -> Utilities and is used to install Windows. Please see  How to install Windows using Boot Camp - Apple Support .

BCA is failing to create the appropriate structure for the MBR part. Can you post the output of the following OS X Terminal commands?

diskutil list

diskutil cs list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

The "sudo" commands will prompt for your password, and it will not be echoed back. You may also see a warning about improper use of "sudo" and potential data loss due to "abuse" of the command.

Please re-run the Gpt and Fdisk commands.

Run BCA and try to install W7. Let it fail and post the output of the GPT and Fdisk commands after the failure.

What happened to your Bootcamp partition? You should also have a GPT4.

Can you download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/ ? Once you have it installed, I can provide steps. El Capitan requires a bit more work than Yosemite.