Hello, I to own a g73 sw and ran into a simmilar problem with an aintel wifi card. After some research and an inspection of the card I found that intel sources out for the cards and does not manufacture them, I reinstalled my Anthros wifi card and redownloaded the drivers from Asus and have remained happy to date. Just a side note I also use a Net Gear USB external on a dongel for increased range. I hope that this helps.
BoDuke