What operating system are you using? The only thing I can think of based on the error message, is that your graphics card drivers are not up to date or haven't been installed properly.
I would read Nick's post at the top of the forum, titled "Clean FSX, Acceleration, SP1 & SP2 Install!" Follow all the instructions step by step for updating graphics drivers. The instructions can be found at this link, within his post.
http://www.simviation.com/cgi-bin/yabb2 ... 53/165#171This post was from November and there are newer divers than the 169.04 drivers specified in the post. Just go to nVidia.com and download the newest drivers for your card and OS; use those drivers in place of the 169.04 drivers.
It probably wouldn't hurt to make sure you have the latest updates at windows update also.
Hopefully this will help you, good luck.