Or buy an Atheros wifi adapter for 5 or 10 bucks on ebay. As far as I know any of the AR9xxx and AR5xxx series will do just fine.Then you take a screw diver and open just the bottom part and replace the one that's in with the new one. I had 3 acer laptops and all of them had the wifi adapter immediately on top - if that is the case it will take you 3 minutes to do so and you will not risk damaging anything.
cheers!
