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How to make a bootable dvd from ISO windows server 2012
Here is a link that explains how to make a bootable usb or cd/dvd. It also gives link to the tool to do it with.
http://blogs.technet.com/b/bobh/archive/2012/09/04/the-simplest-was-to-create-a-bootable-windows-server-2012-or-windows-8-usb-key.aspx
If the .iso is an image of a bootable DVD, and you're working on a Windows 7 PC, it's very simple:
http://windows.microsoft.com/en-US/windows7/Burn-a-CD-or-DVD-from-an-ISO-file