You can find the latest Intel HD Graphics drivers for Windows 7 64 for your chipset here.
Please note,, your current drivers may be OEM (HP) customized for your system and may block the installing of the generic drivers mentioned above. If that is the case, you will have to install the drivers using the Device Manager "Have Disk" method to overwrite the OEM customized drivers. If you do this you will loose any customizations specific to your system. This may or may not be an issue depending on what the customizations were.