Not able to create ubuntu cd

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http://askubuntu.com – I downloaded ubuntu 12.04.1 LTS on a Windows 7 machine. I burnt a DVD from the iso image using Windows disc image burner. I had 'verify disc' on. The disc was created successfully with no errors. I was not able to use this disc for installing ubuntu on another windows 7 machine. I do not get the Welcome Screen on booting. I find that on the disc I burnt, I do not find bin, disctree, programs directories and cdromupgrade, start., ubuntu files. I find boot directory and wubi executable file. I tried downloading several times with the same result. I had similar problem earlier with ubuntu 11. (HowTos)