Hi:
HP (and other PC manufacturers) only support their consumer notebooks for the current Windows operating system in effect at the time of the notebook's production (currently W8/W8.1).
So, you have to hope that you can find drivers from other places that will work on your model.
If you read through this thread completely before installing any drivers (we had some fits and starts with a couple of drivers as you will see), you should be able to get W7 x64 fully functional on your notebook.
This model is pretty much a 17" screen version of your model, so all of the same drivers should work.