vcredist_x## install error: HRESULT=-2146697213

I develop in-house applications using Visual Studio 2010 / Visual Basic 2010.  My template solution is composed of three projects:  the main Windows Forms Application project, a Visual Studio Installer Setup and Deployment project that targets x64 and a Visual Studio Installer Setup and Deployment project that targets x86.

One of my prerequisites is for the Microsoft C++ 2010 x## Redistributable

On some machines the Setup.Exe will fail when trying to download / install this prerequisite.  The temporary folder in the App Data/Temp/.... folder for the install has the vcredist_x## sub-folder created but that folder is empty.

The log file shows the path from which the vcredist_x## download is trying to pull from:  If I cut-n-paste this path into IE10 and Save As to this same sub-folder the download completes and I can run the vcredist_x##.exe and install the redistributable.

I can not find any information on the HRESULT=-2146697213 error that is reported out in the .log file.

I always run the setup.exe by right-click >> run as administrator

Workstation(s) are running Windows 7 Pro.

I have attached the Install.Log file:  What is the HRESULT=-2146697213 Error and how should I correct it?

install.log