Thanks for those solutions to the problem Grandpa but I'm having a problem with them. Although returning my graphics card settings to default DOES fix the problem, I need to once again changed the settings in my graphics card in order to use anti-aliasing in Microsoft Flight Simulator but then I'm back to square 1 and I have the same problem again. I don't like the idea of having to edit my graphics card settings all of the time just to run LW.