My windows 7 Dell XPS Studio 9100 having some issue with DIR-615 (Firmware 7.0)

Here's my setup :
DiR-615 ---> pc1-Win7 | pc2-WinVista | XB360 | pc3-win7 (Dell 1525 Wireless-N PCIe)

All are connected to Unifi w/o any issue except pc3-win7 with Dell 1525 Wireless-N PCIe. I can connect to the wireless fine, IP all obtained successfully. The strangest thing is that i can never access the internet. In Network & sharing center, it has the notification "No internet access"

I tried pinging 192.168.0.1, request timed out and sometimes unreachable. Use the auto diagnostic tool and it says DNS is not responding.
I've also tried setting the IP manually, update the wifi-adapter's driver....same result.

I even went all the way to uninstall the mcafee firewall and disable the windows firewall, no dice.



This post has been edited by PrivateJohn: Jun 23 2010, 08:41 AM

It's a desktop in a different room, so testing out using cat5 cable would be mission impossible (ok, i am lazy to move it )
My wifi security has been disabled, i just cannot connect to the internet. Hmm, changing the network name...you reckon that could help? Maybe i will try that later.