First of all, torrenting copywrited material is not something you should just be open about doing so because in most cases its not 100% legal.
That aside, what format was the download in? If it is an ISO, then you must burn the ISO to a disk using a program like imgburn (its free). An ISO is the image that was on a disk, copied in whole to a computer. So you must put that image back on a disk the same way it came off. You can't just add it to a disk as a file.
If what you downloaded was a different format then I'd need to know which kind of format it was to give you the appropriate method to accessing the information inside.