I think the only way to get rid of that problem is to re-download, also re-downloading won't lose your characters. They will stay untouched. But if your really keen on not re-downloading then may i ask, Have you downloaded any objects for any maps you might have created? if so then you should check the files to see if you have any duplicates of the objects. Also items might be the second problem, a faulty item can keep stopping your game. If that doesn't help then please let me know. I will try to help without you having to re-download it floof XP!