The custom shaders.dll included with this release requires the
DirectX November 2008 Runtime to be installed in order to run.
If you do not have it, it will tell you.

You can download it from: 
http://www.microsoft.com/downloads/details.aspx?familyid=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en