using Windows 8 with a game with directx 11 garrys mod

I have a bundle package asus I got at best buy windows 8, I steam and tried download garrys mod, after that I opened, but he said I need to update directx 11 iam don't know what to do, I've seen many things she and what to do.i saw ways different how to install , but no job, he goes on to say "a .cab file is required for the installation is unreliable please check the cryptographic services are enabled and the certificate file is valid. I tried all the things that people said, but it always happens same thing.i tried to run with administrator and anything I could find.i would be grateful if someone answered it. IAM trying to play mod garys on windows 8

Try the solution here:

http://answers.Microsoft.com/en-us/Windows/Forum/windows_other-windows_update/a-cabinet-file-necessary-for-installation-cannot/9b007762-f6be-4837-928d-59a98378e465

Tags: Windows

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