I think I would do that md5sum verification first. I'ts easy. The md5sum utility is built into Linux. I download my Linux distros to my Downloads folder in my home partition. To do a check, I open a terminal and type cd Downloads. I have to change to the directory where the file is. Next, I type md5sum _________________ The blank space you type in the exact name of that Mint .iso file. At the end it should generate a long sequence of letters and numbers. You want to compare that string with the official one listed at the web site you downloaded from. They must match exactly. That md5sum string is usually quite easy to find at the download site. Write it down or copy and paste it into a new text file. Does this help?
homerscousin@homerscousin-desktop ~ $ cd Downloads
homerscousin@homerscousin-desktop ~/Downloads $ md5sum linuxmint-14-kde-dvd-64bit.iso
homerscousin@homerscousin-desktop ~/Downloads $
I just did it. Takes just a few seconds for me. Took minutes on my old computer. As long as that string in the 3rd line above matches the official one, I know I have an exact copy.
i5 3570k, ASRock z77 Extreme 4, 8 Gb Ripjaws 1600, Antec 430w psu, HVR 1600 tv tuner, custom case- marble top, oak face. Carver & DCM Time Window sound system. Mint 14 KDE.