Why my laptop shut down automaticily after few time...i restart it again and again..what problem in it?

Laptop also shut due to overheating check the fans

Sounds like a thermal issue. A free program called Speccy from Prriform. It ill give temps for cpu, memory, hdd, motherboard, graphics, etc. Some HP notebooks tend to run pretty warm. Best idea s t blow the pc out with air. If you can get to the fan make sure it is clean. Speccy System Information Free Download

Few things can be wrong:
1) you installed software like a game or which was not compatible with you OS - you removed it, and it did not uninstall effectively.
2) You have formatted your machine and wrongly installed OS which is not compatible with your hardware.
3) You possible used some registry cleaner and messed up your registery.
4) You have two antivrus porgrams installed.
5) You have a virus problem and in this case it is so sevre you will have to format
6) You have hardware issues such as RAM Module that crashed, you CPU decided it is time to go - if you have an old machine.
7) If you get a blue screen with error code - it is Operating System issues and it needs to be re-installed,.
8) Start/ boot your machine in safe mode to avoid any driver errors.
9) Listen two the amount and lenght of beeps you can when you computer starts.
Cheers!