Hi:
According to the product specs for your PC, at the link below, it has an AMD processor.
Either the chipset spec listed on the support and driver page is incorrect, or the processor info is incorrect.
I am going to bet that the chipset info is incorrect and based on that assumption, below are the links to the W7 x64 drivers you need.
First install the AMD chipset driver and reboot. First file listed on the webpage.
This will install the smbus and usb 3.0 controllers.
http://support.amd.com/en-us/download/chipset?os=Windows 7 - 64
Then all of the rest of the W7 x64 drivers and software can be gotten from the g7z-2100 at the link below.
DO NOT USE ANY BIOS OR FIRMWARE DOWNLOADS FROM THIS LINK