An unusual error. Obviously you know how to burn the iso as an image. good. Did you burn it at low speed? Even though you used BitTorrent, I would double check the md5 also, in light of this strange error. And if those two things are not the issue, I would consider another burn at slow speed on a 700 meg CDRW and see if that behaves any differently. And if the system has more than one optical drive, absolutely try the other one, as it sounds very much like a problem reading the disc to me.