For some months this has continously crashed and I have been unable to open my tree again. Thus I have continously saved every few moments and copied the file to my desktop so that I do not have to keep redoing my tree. I was using windows vista and this did coincide with a harddrive that had problems. I have a new harddrive and this has windows xp. I opened my tree and for two days all was fine. Now this is crashing too.