My computer has an older version of Ubuntu that I just installed the other day. After realizing how outdated that version was, I downloaded the 12.10 version to the computer. I also saved it to USB and DVD. I cannot get the computer to open with the disc, USB or from the file on the computer. It shows the USB and the disc on the computer, but does not want to open with the new version or give me any way to install it onto the computer.