Hi all, I've been trying to resolve the same networking problem for a few weeks now and finally decided maybe I'd have better luck just asking. So here is the situation, I recently built a new PC with Win7 (64 bits). Unfortunately, I can't connect to my router (Linksys BEFW11S4 ver.4). I am using an NTI 802.11n W-LAN Mini-PCI NIC wireless network card, but I also tried my Linksys WUSB54GC USB wireless adaptor without any more luck. Although I can see my router even connect to it, though it keeps dropping or disapearing, but I can never ping to it. This problem is only when I try to connect using wireless connection, since I can connect properly when I'm directly plugged in my router. It seems as though my network adaptor's driver are properly installed, as it shows up in my device manager without any warning mark. I already tried TCP/IP stack repair (not sure how it could help...), unfortunately this didn't help. So if anyone has any advice, it would be much appreciated. Thanks!