What Chuck said...........and.......what's worked for me from time to time, when I get the fatality notice, is to have a good clean fsx.exe and visualfx.dll copy handy.
Deleting the fsx.cfg has worked for me when I'm hit with a smattering of fatals, usually when/after/during I've done something to something and knew absolutely nothing about what I was doing.

For instances when FSX will not start at all, and I get the all too familiar fatal error thingie, replacing the fsx.exe and visualfx.dll handily corrects the issue.
Fortunately I don't get a lot of that too often anymore, but trial-n-error and the awesomely knowledgable folks around SimV have educated me a ton!

Last edited by U4EA on Sun Jun 05, 2011 1:45 pm, edited 1 time in total.