Oh I didn't see that, the picture threw me off. I thought you had 2GB. :doh:
Like cichlidfan said, Try out DCS: World and see how at least the game world runs. It has an Su-25T that you can fly around. http://www.digitalcombatsimulator.com/index.php?ProductId=21&end_pos=137&scr=product&lang=en
This game mostly taxes the CPU, the graphics engine is much more efficient than anything Microsoft could come up with for FSX.