Thanks, very gentle from you. To say the truth i opened this topic for curiosity, i use this old pc only for mission editor, training and storage (in the lifetine every simmer has canghed almost 10 pc, like me). The unusual behaviour on loading despite the normal one of other modules hid something different than, for example, a memory crash, i never seen a complete crash like this one. Anyway tomorrow morning i'll wake up my pc number one (used only to fly seriously): i'm sure the F-15E will fly very very very fast...
(P.S.: an update for the pc n.2, following your tips, is necessary, at this point.)