Problems in installing Windows SDK 7.1

Hi everyone,

working with 'mex' I was asked by Matlab to install a compiler. I am trying to install Windows SDK 7.1 but without any success. I am using Windows 7 enterprise 64bit.

The installation fails because: "The signature of the file WinSDK_amd64.msi could not be obtained. Possible unsigned file."

I already tried the following:

- uninstalled Microsoft Visual C++ 2010 redistributable from control panel.

http://www.mathworks.com/matlabcentral/answers/95039-why-does-the-sdk-7-1-installation-fail-with-an-installation-failed-message-on-my-windows-system

- uninstalled .NET 4.5 from control panel.

http://www.mathworks.com/matlabcentral/answers/101105-how-do-i-install-microsoft-windows-sdk-7-1

- set the user as admin fllowing this procedure

http://ctrlf5.net/?p=184

No one of the previous attempts worked. I really need you help.

Thanks and please let me know. Cheers Federico