Could it be because it's 64-bit? I just successfully ran it (UNetbootin one) on an HP Z210 workstation in my engineering class. It loaded just fine. The problem being, I don't have access to that PC for 12 hours to install the 2012 version.
...and don't say, "WHY DIDN'T YOU TELL US?" because I did provide a link with all specifications (I think).
And for whatever reason, the retards over at HP set up this desktop with RAID boot stuff, and it has 1 drive. ONE. Period, (comma) end of story.