How to downgrade from Windows 8 to Windows 7 ultimate by USB and iso file

I am trying to downgrade my laptop because i simply cannot stand windows 8. I dont have a disc, just the iso file and usb (its pre-activated). Ive tried the Windows USB DVD Download tool, but apparently it can't copy the files because of either the USB (which i know for a fact it isnt) or the iso. Please help.
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More about downgrade windows windows ultimate usb iso file
  1. You're gong to have a problem, unless you have a valid installation key.
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Downgrade Windows 8 ISO USB