I am not as computer literate as some of these esteemed folks here Spud, but if you wanted to try it, find your fsx.exe file, right click it, and choose 'run as Win XP.' I don't remember having to do that for FSX in Win 7 64 bit or not. I do know that after installing any ORBX or FSS software it tells me that the program was not installed correctly and re-install it with the recommended settings. I assume the recommended settings are Win XP settings...32 bit settings. I dunno...just trying to help. What else could be the problem on a new machine and a clean install? That's the million dollar question. Doesn't hurt to try. Troubleshooting 101.