Ok got this sorted. When I was trying to deal with the performance issues, I did once run the game as admin. Noting the warning I then delated the ProgramData folder for FAF before one of the many reinstalls.

On a whim I tried to run as admin and again and game worked. So removed FAF, made sure folders gone. Did a cclean reg tidy up, and reinstalled and now working. Back to the performance issues but thats a seperate issue.