Visit the Downloading FAQ and read about "What are these strange MD5 files that accompany the ISO CD images?". It contains instructions for Linux & links to programs for Windows.
Once you have confirmed that the ISO is perfect & not corrupt, then you can either read another FAQ "I have downloaded the ISO file. How do I burn the ISO? How is the ISO supposed to be burned?". If you do not read the FAQs or follow our advice then you will most likely waste your time with the result of another non-working CDR.