Wireless connected but “No Internet Access”

i have a 64 bit windows 7 desktop that uses a D-link (DWA-140) wifi usb dongle. It worked fine at another house but at home where my whole family uses the wireless with no problems (d-link router) it will connect but says no internet access. I have tried:
-uninstalling AVG
-refreshing and renewing ip adress using ipconfig
-reseting router
-uninstalling and reinstalling wifi dongle drivers
-forcing plustnet’s dns adress
-disabling TCP/IPv6
-turning firewall off

i can happily connect to the portable wifi hotspot on my phone ….
PLEASE HELP!!!!!!!