Unexpected system shutdown

[Guest]

Hello,
i have got Compaq laptop,it starts normally but after 15 minutes it shuts down the system. I tought i can be a virus and try to format the hard drive but it is the same it couldn't pass 15

 

[Emerald]

Is the laptop getting hot?

 

[HavoCnMe]

Are you allowing the bottom vent to suck air in and blow it out the exhaust?