Ubuntu installation

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http://ubuntuforums.org – I have downloaded ubuntu-12.04.2-desktop-amd64 on my PC. To install it from a pen drive, I have put the image iso file of ubuntu-12.04.2-desktop-amd64 to a pen drive using Universal USB installer. On restarting my PC ,the ubuntu is loading. Even when I run wubi application file from the Ubuntu installed pen drive,its showing the message “Could not retrieve the required disk image file For more information, please see the log file: C:\users\win7\appdata\local\temp\wubi-12.04-rev272.log” , after entering the username and password. Can someone out here help me ?? (Hardware)