Unfortunately, creating a USB bootable from the DVD requires a DVD drive. System builder copies of Windows 8, which is what you most likely have, are designed to work with their specific key. You can create a USB bootable using this process on another machine and use the USB bootable on your father's machine.
http://www.addictivetips.com/windows-tips/copy-windows-installation-dvd-to-bootable-usb-with-wintoflash/
My personal suggestion is to just buy a $20 external DVD/CD writer that connects through USB, such as this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136261&nm_mc=EMC-IGNEFL071813&cm_mmc=EMC-IGNEFL071813-_-EMC-071813-Latest-_-ExternalCDDVDDrives-_-27136261-L0I
Without an internal DVD drive, you might find something like this to be very helpful in the future.
As for using an ISO from another source and trying to use your key with it, good luck. There are some ways to make things like this work, such as duping an Upgrade package into installing using a key you already have. I have three copies of Windows 8 and generally the results of trying things like this are pretty poor and depend on very specific things, such as an OEM Windows key being embedded in the BIOS, to work. If you go this route, I wish you better luck than I have had.
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