How to remove win 8 and install win 7 in bootcamp

I want to completely remove win 8 and install win 7 in bootcamp. I followed the steps in bootcamp assistant and it appears to remove the win 8 partition. However when starting a new win 7 bootcamp partition and installation setup still thinks win 8 is being used. how do I get it to recognize the win 7 now being installed from the usb drive? This is on an iMac 27 late 2012 with OS x 10.10.1

Hi Janesdf,
Welcome to Lenovo Community!
As per the query we understood that you are looking for Windows downgrade on your Ideapad N580.
Before doing any changes in the system HDD partition or with Windows OS, I suggest you to create the system recovery media and then you can downgrade the OS. But you require Windows 7 recovery media.
Hope this helps.
Best regards,
Hemanth Kumar
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