Can't downgrade Windows 8 PC to Windows 7

Got a Windows 8 laptop on which I am trying to install Windows 7 using a genuine disk. However, when booting from the CD I get a "Checking media......FAIL".

I have disabled secure boot in the BIOS and have also changed UEFI firmware settings but neither of these methods have helped.

Any suggestions?
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rindiConnect With a Mentor Commented:
First of all, if this is Windows 8 Pro you can get a free upgrade to Windows 7 Pro from the manufacturer (you might have to pay for shipment if you get physical media or handling costs)...

If the above doesn't apply because you don't have the Pro version, I suggest you burn the Windows 7 DVD again.
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