Bentley Structural Synchroniser Installation Error!

Hellow all,

I have been trying to install Bentley Structural Synchronizer on my computer (Windows 7 x64) to exchange files from STAAD.Pro v8i SS3 QAR with other programs such as Revit and ProSteel.

However Installation always fails when the Structural Catalog is about to install:  

"There is a problem with this Windows Installer Package. A script required for this install to complete could not be run.  Contact your support personnel or package vendor."

In the Computer Management Console I see the following log:

"Windows Installer installed the product. Product Name: Bentley SPC Server v8i SS1. Product Version: 8.11.8.23. Product Language: 1033. Manufacturer: Bentley Systems, Inc.. Installation success or error status: 1603."

Any help will be greatly appreciated!!  All other products work fine....