I use a nvidia 8600gt with FS9 and it works great. Nice smooth lines. As long as I run it in full screen. Windowed mode gives jaggies. That's no biggie since I use full screen.
The problem is I use extra software on top of FS, such as FS Passengers, or Vatsim software or Electronic Flightbag stuff. Whenever I start any addons, or hit ALT to access the menues, the jaggies appear.
Can anybody tell me why that might be? I use new drivers and installed them per the detailed instructions offered by Noell.