Install DirectX Error

I installed the Direct X needed by a game.After download the Direct setup for VGA,I installed the applications.But it popped up an error :

"A cabinet file necessary for installation cannot be trusted.
Please verify the Cryptographic Services are enabled and the cabinet file certificate is valid. "

What to do now?please help me.

If you download and install the DirectX Redist package, it will install/update directx and solve any issues your having

Download DirectX Redist (March 2009)

I think It will work fine in windows 7.