Since you cant setup your wireless router on your own and have tryed @poppy's sugestion (if they dont work), I would sugest you ask for a help from someone who knows his way with wireless routers, to set it up for you.
BTW. I wouldn't advice flashing the bios, unless you've tryed everything.
And if you do decide to flash your bios, ask for help from someone who has some knoledge about bioses, couse if you make a mistake you'll end up with a brick...