theogt;2768924 said:
Weird that they'd have an .iso file as the download file.
Oops. As a last resort in these matters it's a good idea to read the instructions...found this there
Step 2: Create an installation DVD
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How to create an installation DVD
The RC download is an ISO file, which you'll need to burn onto a blank disc before you can install it. To do that, you'll need to use software designed for burning ISO files.
In addition to commercial ISO burning software, there are free programs such as ISOBuster and Active ISO Burner. To find one, go to a site such as Download.com or Tucows and search for "ISO," "DVD," and "burn".
Follow the instructions that came with your program to create a Windows 7 RC installation disc.