first upgrade to W10 then u can do a clean install, W10 will install the drivers for u , after clean install reboot then install the W10 drivers from your support page G551jw
all drivers will work in W10 except the ones u found on your support page , I did not install any other drivers except the W10 ones from my G751 support page , everythings works just fine. if u find problem make a new post do not use any software like driver booster just let w10 do the work blue tooth audio will all work I'm sure