I havent used Mission Builder in a while and when i tried to start it up today, it openned and while still on the opening picture gave me one of those "failed to initialize database" error msgs. i reinstalled CFS2 and still the same. I didnt delete all the other files in cfs2 however bc i dont want to lose all my addons.....anyone else ever have this problem or know how to fix it?

That could be the problem, the easiest way to check would be to remove a few of your aircraft and see if it has any affect.