How to Create Windows 7 Bootable DVD using Nero
Solution 1:
If the below screenshot matches what you see, you simply need to select the DVD-ROM (ISO) option in the sidebar on the left.
If the sidebar doesn't match what you see, I can't help you with Nero, as I don't use it. However, in that case you might try seeing the instructions at http://www.ubuntu.com/download/ubuntu/download. Click "Show me how" at Step 2 ("Burn your CD or create a bootable USB stick").
