Two things:
1- I would go with the ISO download. A ton of programs will burn ISO files which is an image file. Nero does it with no problems. This way if something goes wrong you have it on disk.
Nero Lite For Free
2- $30 bucks??? Seems steep. My daughter just bought a Windows 7 disk at her college bookstore for $13.49 which is good for up to 3 computers.
Ron