I've been Googling this problem for at least 2 hours and still haven't found a solution. I've had this problem for a while now and I didn't really mind since I still have access to the internet. However, today I was trying to access my HomeGroup but it tells me that I'm not connected to the network. I haven't installed anything. Just one day, I turned on the laptop and there the red x was. I haven't had any problems with Windows 7 aside from Firefox crashing all the time. I think it blue screened on me two or three times too.