Windows 7 and Windows 8 offers native support for burning .iso images. You no longer need to use 3rd party software. To do so, right click on any .iso image. In its right click context menu you will see an option to Burn disc image. Make sure that you have inserted your DVD.
Burn ISO image
Clicking on it will open the Windows Disc Image Burner.
This give you the option to burn the ISO image to CD or a DVD, and to verify the disc after burning it. Do check the option to Verify disc after burning.
Click on Burn.
If you wish, you can also change the burn settings. Right-click on the CD/DVD drive and select Properties and click on Recording tab.
Clicking on Global Settings button will offer you a few more options.
These Free ISO Burners for Windows may also interest some of you.