My P3D 5.4 has a chronic problem that I just discovered today. As I have my take off roll set and I am rolling down the runway when I reach a 100kts, simulator froze. I have to use task manager to end it so I can use my computer. This happens with my PMDG 747-400, Drzewiecki Design Tokyo Narita add on, OBRX global base vector, envshade, REX skyforce 3d weather engine on, FS2 crew on at the same time. I have saved my flight at runway entry point and when I load it up for take off and then take off, the problem happens.