I have been using dual boot in my lap top, windows xp and windows vista. I switched off my computer I did not take out one CD which is already inserted. I switched on my laptop. It stopped in option area I have to select either Windows xp or windows vista. I highlighted windows vista and and pressed enter. Then vindws vista not starting. It was ok before. What can I do now. Is my Windows vista os currupted? Once I go to windows xp it is working properly.