[wubi] wubi installation on laptop failure

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http://ubuntuforums.org – Last week I purchased an ASUS laptop, with Genuine Windows 7 Home Premium 64-bit. I downloaded Ubuntu via wubi (from ubuntu.org). When I turn on the laptop, I get the dual-boot options. I can proceed to Windows without problem, but when I choose Ubuntu I get a failure message, with these details: File: ubuntu\winboot\wubildr.mbr Status: Oxc0000098 Info: The selected entry could not be loaded because the application is missing or corrupt. Can anyone help? Thanks very much indeed, Laurence (Hardware)