One thing that I would also suggest is that when you are simming, please re-start the computer before you start playing.
At times, windows is not doing a good job releasing memory even though you have quit the program. For example, if you have been surfing the net using IE 5.0. Even though you quit the program, windows still save quiet a bit of information in RAM. Hence if you start the game right after surfing the net, there is 90% chance that FS2000 will either crash of be super slow.
This apply to all window program. So I suggest that you re-start your PC before running FS2000.