You know I have download LinuxMint13 (Mate) but it failed to run on Virtualbox. I checked it's md5 following this How to check md5sum of ISO on Linux method. I am sorry to say that md5 hash does not match with supplied number. That is both number are not same. So, I have done some Googling and found a nice and helpful way to repair my corrupted ISO file.
|size does not match downloaded linuxmint13 iso|
You should have a torrent client to do this job. Download a torrent client. Most of them are free to download and use. I am using Transmission BitTorrent Client on my Ubuntu machine.
First of all find a torrent of the exact ISO and download it for about a minute. Then, stop and close the client. Now replace the torrent data file that you were downloading using the client with the corrupted ISO. Re-open the client and start the download. The client will perform a hash MD5 check on the current data to see what file segment downloads are necessary. If you correctly found a torrent of the exact ISO, the client will re-download the segment of the corrupted data and rebuild the file. In the end, you should be good to go!