Hi:
HP only supports their business PCs for other than the current Windows operating system (W8 at this time).
First, you need to install the AMD chipset driver and reboot. First file listed.
http://support.amd.com/us/gpudownload/windows/Pages/raid_windows.aspx#2
Then all of the W7 x64 drivers and software from this related model should also work on yours.
DO NOT USE ANY BIOS OR FIRMWARE FILES FROM THIS LINK