Hello and welcome to the forums.
My standard boilerplate answer would normally be.... it's new (4 months old), have it serviced, repaired or replaced under the provisions of the factory warranty.
But what they are likely to do is something you can do yourself in the comfort of your living room which should take an hour or so, two tops.
Back up all your critical data (photos, music, email, favorites, documents, spreadsheets, etc., ) to an external source (USB Drive).
Then perform a factory reset. Google up how to do so on your particular make and model laptop. There is almost certainly a factory recovery partition on the system which should put everything back just like the day you brought it home.
Install all the updates from Windows Updates (excluding any hardware updates as they always seem to muck something up), then if it seems to be performing as you would expect put everything back from your external backup.
If not then take it back where you got it and tell them the problem and insist that they either get it working properly or replace it.