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If you haven't already, you might want to delete the sources\ei.cfg file from the media so it can be used to install any edition.
To burn an iso:
Rt click the iso and there should be an option to burn it to dvd.
Alternatively, extract the iso to create bootable usb. The usb stick will be formatted, so make there is nothing on there that you want. Gburner can do it
gBurner - How to Setup Windows 7 from USB drive?