1) go to intel.com website. Install the intel utility to automatically find the drivers required for system. Use that utility to scan ur system. It will tell u the drivers u need to download and install.
2) Go to windows update in windows 8.1 and check for updates. After checking, go to optional updates it will show u the intel drivers u need to install in ur system. just download and install.
By the way, hp has not published any drivers for windows 8 for ur system. U will only get those from intel. If still u are unable to find the drivers, dont worry as microsoft generic drivers are enough for now to run in ur system.