My laptop pc is getting over heated

Hello,
I have a laptop pc which is having trouble recently due to over heating problem. It was running well lately but nowadays it gets heated real quick and results in a automated shut down of the PC. When I restart it shows the option to start windows normally. I do not know what is causing this problem. Please kindly help me get out of this problem. I need to work on my laptop consequently and without any disturbance so this is a real disturbing problem for me.
Leo Kingston
