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Downgrading to win 7

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I just bought a win 8 computer and trying to install win 7 computer. I found a win 7 home premium 64 bit iso online and put it on a bootable flash drive. When it goes to boot from the flash drive I get an error saying

"Windows Boot Manager
A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.
If you have a Windows installation disc, insert the disc and restart your computer. Click "Repair your computer," and then choose a recovery tool.
Otherwise, to start windows so you can investigate further, press the ENTER key to display the boot menu, press F8 for Advanced Boot Options, and select last known good. If you understand why the digital signature cannot be verified and want to start Windows without this file, temporarily disable driver signature enforcement.

status: 0xc0000428

Info: Windows cannot verify the digital signature for this file."

Not sure where to go from here. Any help is very much appreciated.
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Please read this article, note that you must have a legal product licienc key, (then we can help you) If you downloaded the ISO image from anywhere but the listed sites, it will be hacked in some way and that could be the reason for your problems.
If the key you are using is not legit. the policy of G2G means we would not be able to help you.
> http://www.raymond.c...al-distributer/
Thank you for your understanding.
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