With all due respect gentlemen if you lay your frustration to one side for a moment and contemplate on what is usually referred to as 'common sense', the fact that so many others seem to have had and are having the same problem might lead you to the conclusion that the question has not only been asked - but also been answered a thousand times.
So I'll make two basic suggestions which will hopefully prevent you from smashing your computer to pieces or 'borrow' dad's sawn-off shotgun and go shoot the neighbours or join the extremists / fanatics hoping to meet everlasting delight in the company of I don't know how many virgins after you've blown yourself to smithereens.
Firstly: Use the SEARCH function. The purpose of the SEARCH function is to SEARCH for answers. Make sense?
Secondly: If the SEARCH function plays 'hard to get' you can always post your question/problem here in a legible manner... by that I mean
Give us some information!!! such as file-name, file-library, name of the author, your Operating System and whether your copy of FSX is pirated or legit... anything. The majority of problems can be traced back to pirated copies... so in this case I should really advise you not to bother and waste our time.
Pretty simple, eh?