Hi,
First, download the latest Synaptics driver installer on the link below and save it to your Downloads folder.
http://ftp.hp.com/pub/softpaq/sp55001-55500/sp55107.exe
Next, open windows Control Panel, open Programs and Features, if you see an entry for 'Synaptics Pointing Device Driver', right click it and select Uninstall.
When this has completed, restart the notebook.
When windows has fully reloaded, open your Downloads folder, right click the Synaptics installer and select 'Run as Administrator' to start the installation. When this has completed, restart the notebook again.
You may now need to configure the touchpad as described in the HP document on the following link.
Regards,
DP-K