Are you going to use a Win 7 or Win 8 license?
For Win 7, download this ISO here:
http://www.microsoft.com/en-us/software-recovery . You have to put in your license key, and it will provide the correct download.
For Win 8, download this ISO here:
http://windows.microsoft.com/en-us/w...-refresh-media . You have to select the correct version, and it will download and create the ISO for you.
Microsoft doesn't provide the iso's direct via digitalriver anymore, and instead use these Media Creation things. You can create the ISO from there, and slap it onto a USB drive with the "
Windows DVD to USB Tool" and install windows that way. Its how I do everything now.