Hi:
You probably are missing more drivers than that one.
First, install the AMD chipset driver and reboot. First file listed.
http://support.amd.com/us/gpudownload/windows/Pages/raid_windows.aspx#2
Then most if not all of the W7 x64 drivers and software from this model should also work on yours.
DO NOT USE ANY BIOS OR FIRMWARE DOWNLOADS FROM THIS LINK
The HDMI driver should install with the graphics driver from the above link.