I downloaded ubuntu-12.04.2-desktop-i386 iso.Then i burn it to a DVD.But i can't run it as a live cd on Windows 7.I changed the bootable device oreder of BIOS also.Why is that?

How did you burn it? Did you burn the ISO to the disc as a file, or as the complete image? It must be written as a complete image, and then you need to verify the disc checksum (md5sum is most common) to the iso checksum to be sure it was written successfully.

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