[laptop switches off after sometime]

when i start the laptop after i have loged on the laptop switches off then again i try to open it it again switches off but after trying for 3 to 4 times it switches on

 

 

 

Operating system:Windows 7 Home Basic (64 bit) Service Pack 1

System root: C:\Windows

Available physical memory: 6007 MB

CPU: Intel® Core i5 CPU M 450 @ 2.40GHz

Drive Info:

C: 236.70 GB

E: 107.42 GB

F: 111.59 GB

Internet Explorer: 9.0