If you/anybody still care(s). I fixed the problem without the help of Asus. I opened the laptop up and found that one antenna was disconnected. It works flawlessly now. I knew it couldn't be a software problem. Thanks for your help anyways.
Matthew9012, Do you have any details (w/pictures?) about the procedure that you used to diagnose and fix this problem? My issue with the N53SV sounds exactly like the one you were experiencing. and it drives. me. crazy.