Screen Resulation Problem with Intel HD 3000.... Please help me... #GPU

My Laptop Configuration :







Model: Dell n4050 i3 2nd Generation , 2 gb ram, 500 hard Hisk, Intel HD Graphics 3000







I have completed setup successfully but my Screen resolution is 1024*768. I can not change this to 1366*768.







Please help me.....







Anyone please help..







Moumtain Lion 10.8