lmonast, that definitely clears things up quite a bit; you don't seem to have any valid boot code in the MBR of your sdb USB drive that I can tell, and it's only 53 bytes in length. In fact, that error message you are getting is coming from an error code in the sdb MBR. Also, I notice your USB drive geometry is a little different since you used Vista to format it, so I think you would be better off using a Linux tool to format it; I think theoretically it shouldn't make any difference, but better to play it as safe as possible. I would try reformatting the drive with Ubuntu's gparted (System > Admin > Partition Editor), and then reinstalling. How about giving that a try and letting me know what happens.
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