No drivers after fresh install

I have no USB, Ethernet or WIFI drivers. This is a windows 8 PC, that was downgraded to windows 7. It is an ASUS x-502C laptop. I am unsure how to proceed, as i know there are drivers windows comes with that i could select from a drop-down, but do not know what to choose

Again, USB is not working so i can't get drivers over from the ASUS website on a flash drive, or connect to the internet to download them. Can anyone save me?