A little late to the party, but it looks like it's an MSI wrapper given the command-line switches. Try adding REBOOT=ReallySuppress to see if that works. Thanks for the advise, It was better that I would posted the solution, for that I apologise. The problem was A damaged ISO made with 7Customizer. I started all over again with a fresh install and fresh WPI and it works now. Thanks for the reply.