Recently, when I needed to install windows 7 on my new quad core desktop. I had the windows 7 ISO image, but I did not had any burning software installed on my laptop. But I had windows 7 installed on my laptop too, and when I right clicked the ISO image in windows 7 I saw Burn disc image in right click context menu.
Once you select this option you will see the new window dialog, which will allow you to burn the image to CD or DVD instantly.
Click Burn button to start writing to disc, optionally you can select to Verify disc after burning. You can also read some more windows 7 tips written by us before on this blog.