I believe he is using FS9, not FSX...My prerogative is to try reinstalling if everything else fails (driver + nhancer). Apart from what I wrote above, I don't do anything else to make AA work on my 8800GT.

Well after alot of messing i've finally got it sorted.I'm using driver ver 185.85 and nHancer 2.5.7I uninstalled everything relating to Nvidia from add or remove programs. Then booted in safe mode and removed everything using DriverSweeper before restarting in normal windows. Then installed 185.85, then nHancer and using the same settings as above with global and profile the same and in game AA enhancement OFF, it's worked.Thanks for your efforts.

I am kinda puzzled now that I read that you are using 185.85 with W7. An old driver with the new Nhancer version - actually a bad mix. Usually makes problems. I have the latest driver and newest Nhancer.But if you got it sorted out, that's fine.