How to install windows 7 in i mac model A 1224 where a message of an operating system wasn't found

how to install windows 7 in i mac model A 1224 where a message of an operating system wasn't found. Try disconnecting any drives that don't contain an operating system.

Thank you sir for replying my question, but unfortunately iwas using only windows 7 on my imac A1224 as my mac OS removed accidentally on earlier. Now there was only windows on the drive. i was trying to updating my windows, then on restarting, it can't boot properly (not taking cd or booting from Hd). if there is any hot keys for booting from cd or hard disk? i'm very grateful as you can help me in this problem.
thank you once again
with regards

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