Thanks Richard, I'll give it all a try. FS2002 runs fine and so did the 2004, until I added the extra scenery. I am guessing there is just too much info to process at once. The 4 discs for the terrain is, as you can imagine, a huge programme.
And yes, this is a great forum. I always feel relaxed when posting knowing there will not be a pack of wolves at my throat as soon as I press the send button !