MSE for Win7 64bit is corrupted [x64 MSE English Corrupt Download (2/22/13)]

[AWS]

Hi, i have downloaded the MSE for Win7 64bit at http://windows.microsoft.com/en-us/windows/security-essentials-download. After the download and when installing the file, it says file is corrupted. I'm using a service pack 1, i assume it doesn't concern
any service pack with my OS. Do you know where can I download the working installer? Or any idea how can install it correctly? Thanks.

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