I have the same problem as well - no buttons or displays working in the VC and no gear shown in the external model. I also do not get the green "Initializing..." messages right after loading the plane. And since the displays for the FMS do not work, there is no chance to check the license or enter any keys etc.
I installed the SP1 for the 772 first, and the 77W expansion right afterwards (virus scanner, firewall etc. all turned off). The patched 772 works perfectly fine.
Thank you the most for your input & help!