Bovingdon, still having your problem with fs2k mate? I had exactly the same problem as yourself! "This program has performed an illegal operation and will be shut down"...
I am no computer expert and don't pretend to be one. I called the £1 p/min helpline and came off the phone non the wiser(robin' B'stards)Eventually I got hold of someone at PC World and he assured me that the only way to correct the fault was to re-set your PC to the manufacturers settings (see PC handbook)...a bit harsh I know but it works just fine now!! anyway must dash i'm off to Funchal in my B777 ???!!!!