Sorry to hear that you are having problems with your new keyboard. I can certainly understand that feeling. I nearly got a heart attack yesterday, when I plugged my newly received G80-3000, Windows told me that the USB device could not be installed. I felt an adrenaline rush. I switched USB port, and it worked. Phew!
Like bhtooefr suggested, you should get an RMA. There is a clear pattern there. When you press the wanted key, you also get the one underneath it, but to its right. Are you getting @W when you press on @?