Hi, Kenny:
The AMD chipset driver I posted above is the only one that you can use.
That will install both the smbus and usb3 controllers.
I suggest that you try reinstalling W7 again and make sure you install that driver first before any others.
Then reboot.
Then you install the video, and then the audio, rebooting after each installation.
After you install the chipset driver, all of the software and drivers from this related G7 model should also work on the g6 you have.
DO NOT USE ANY BIOS OR FIRMWARE FILES FROM THIS LINK