Well, if you just got it. I would recommend returning it, if you are not satisfied; and, read some reviews or get recommendations on other laptops, that are good for what you wish to use it for.
Or, call HP tech support for an RMA.
Or, see, if there is a bios update to address any over heating issues.
Since, it is new I would not recommend tearing it down or trying to fix the overheating issue yourself.