I can't install Nsight visual studio edition

My operating system is windows 7 64bit.
My Graphics Card is Geforce GTX 560.
I installed graphics driver version 332.21.
I’m using Cuda toolkit version 5.

After I downloaded Nsight visual studio edition version 3.2 win64. And trying to install it this message appears to me, “this installation package could not be opened. contact the application vendor to verify that this is a valid Windows Installer package”.

Can anyone help me?

Hi,
Could it be that the package was not downloaded successfully? I did a quick search, and see if this helps you (I haven’t tried nor I know if it will work):
http://www.youtube.com/watch?v=Z3uUwu0AwBI

Thank u for ur reply.
But unfortunately, I did all the steps in this video but the same message appears to me again :(.