How can I install windows 7 on imac 27 late 2012

I wanted to install windows 7 64 bit on a iMac 27 inch late 2012. Everything went smooth until it restarts. Then I get the following message.
Non-system disk
Press any key to reboot.
After this, there is no reaction. By the way, I don't have Fusion Drive. I have normal SATA drive.

Hey Guys,
I was able to start boot manager. I had 4 options:
1. Macintosh HD
2. Recovery-10.8.2
3. Windows
4. EFI Boot
I choose option 3 (Windows). But i got the following message.
CDBOOT: Couldn't find BOOTMGR
Any idea?

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