i am using intel core 2 duo processor. My computer automatically shuts down when i install windows 7 or windows 8 after a certain time. but i am not experiencing this problem while i am using windows xp. why is it so?
It sounds to me like you don't have enough RAM. XP only requires a minimum of 128mb. While Windows 7 and 8 both require 1-2gb (depending if you are running 32-bit or 64-bit). How much ram do you have on your machine?