Help with Antialasing in GTX280

I just bought a new computer to run FSX. The problem I am having is lines are all jagged. I have tried everything, but I can't get it to display clear. I have the antialasing on in the FSX and in the Video card as well and that is about the best i can get which is still poor for the money I spent.I have tried only the game antalasing, and also only the video card but both ways were worse then having them both on. I am running an LCD 32' monitor/TV at 1360 X768 resolutions, ( that is the best this monitor can do) and at lower resolutions it is the same. I have tried everything I can think of but I still can't get it to display right. Here is the specs for my computer
Windows XP Professional Edition SP3 32bit
3.0GHz Intel Intel Core 2 Quad Q9650 Quad Core Processor
CPUCooling System COOLERMASTER brand
Evga 750i SLI Mainboard, 1600MHz FSB -
4GB (2 x 2GB) Corsair Dominator XMS DDR2 1066MHz part #:
TWIN2X4096-8500C5DF
1GB EVGA GeForce GTX 280 GDDR3 Graphics Card -
1000 Watt Approved SLI Power Supply - antec tpq-1000 -
20X DVD+/-RW Optical Drive w/ Lightscribe
500GB, 7200 RPM , 32MB Cache, Performance Hard Drive -
High Definition 7.1 Integrated Audio
The video card has a Gig of ram in it.
I would appreciate any help I could get on settings for this video card to try and clear the display up and get rid of all the saw tooth lines.
Thanks
Pickup
Windows XP Professional Edition SP3 32bit
3.0GHz Intel Intel Core 2 Quad Q9650 Quad Core Processor
CPUCooling System COOLERMASTER brand
Evga 750i SLI Mainboard, 1600MHz FSB -
4GB (2 x 2GB) Corsair Dominator XMS DDR2 1066MHz part #:
TWIN2X4096-8500C5DF
1GB EVGA GeForce GTX 280 GDDR3 Graphics Card -
1000 Watt Approved SLI Power Supply - antec tpq-1000 -
20X DVD+/-RW Optical Drive w/ Lightscribe
500GB, 7200 RPM , 32MB Cache, Performance Hard Drive -
High Definition 7.1 Integrated Audio
The video card has a Gig of ram in it.
I would appreciate any help I could get on settings for this video card to try and clear the display up and get rid of all the saw tooth lines.
Thanks
Pickup