I going to answer my own question. Since posting my question I found that the limited edition of Install Shield in Visual Studio 2012 can be setup to sign the installation program (if you have a proper digital certificate).
This is found under: Builds/Express/SingleImage. There is a tab named "Signing". Enter the path/filename for the Digital Certificate File, the Certificate Password, and specify which output files you want to sign. Install Shield then signs the installation program upon a build.
My apologies for asking this question too soon. I should have done more research first.