Help!!!!! could you help me, im havin problems with my pc every time i turn it on it starts to

Question

could you help me, im havin problems with my pc every time i turn it on it starts to load the windows xp but then it stops and the screen gose blank and then it gose to the safe mode options and last good configuration screen it dose this all the time and im not sure whats wrong with it or how to solve the proble. if you could help that would be great