ok. I would download ALL the win8 drivers found here... during the windows install it should give you an option to install drivers, use that option to install chipset drivers http://www.asus.com/Notebooks_Ultrabooks/K55A/HelpDesk_Download/
Make sure you download all the drivers available there, you'll likely need them all before you're done, but you'll need the chipset and any sata/raid/storage drivers in order to install windows.