You did not say if your installation is on a Laptop or a Virtual Machine, and which one? VMware or VirtualBox?
You did not mention what else is installed on the computer as well?
Ensure you have Microsoft .Net 3.51 installed and you run DiagBox as Administrator.
For the PSA agent, this usually occurs on VirtualBox. Follow the instructions for adding a "System Serial" explained here:
http://www.tlemcen-electronic.com/fo...ad.php?t=60970