Windows 7 natively support the ability to burn ISO images, without needing of a third party tool. What’s great about Windows Disc Image Burner is that it will detect that a DVD-RW has content on it already and prompt you asking if you would like to erase the disc and burn new content to it. This ensures you don’t accidently erase and burn over something important that may be on that DVD-RW disc.
To burn an ISO image in Windows 7, simply right-click on an ISO image and choose “Burn disc image”. This launches Windows Disc Image Burner, giving you the option to burn the ISO image to either a CD or DVD. If you check “Verify disc after burning”, it will verify the ISO image burned correctly. Choosing to verify a disc you burned will require additional time so if you’re in a hurry, you will probably want to ensure this option is unchecked.
Source:→ Windows Blog