Windows 7 has built in support to burn ISO images, and so no external CD/DVD burning program is required to burn the ISO file.
To burn the ISO file, run
Windows Explorer by clicking both the
<Win> (the button with the Windows logo) and
<e> together, or double click on the
My Computer icon on your desktop.
From there, find your ISO image and right-click on the file. You'll get a menu similar to the screenshot below.
Make sure you have a blank CDR/CDRW/DVDR/DVDRW in your optical drive's tray, and click on the
Burn disc image option.
Now you can sit back and relax while waiting for your ISO image to be written to your optical disc.