You probably need to go to gigabyte and get SATA drivers for your motherboard, assuming your harddrive is SATA. Look for a special download you can put on a flash drive or floppy or something like that. If not, see if they have a FAQ about loading drivers during the install. There may even be something on your motherboard CD, but I do not know if you could use that to install them, you might have to copy them to another media.
On the bottom of the screen you seem to be having problems with, there should be a load drivers button.