I'm sorry to hear that you're having this issue.
It is possible, but you may need to make changes to your AirPort configurations and to do that you'll need to contact Apple or check out the Apple Support site for FAQs, Troubleshooting and Support Topics.
You can find that here. http://www.apple.com/support/airport/
Note: When using AirPort Express, you may not be able establish a connection if you're using WEP security. Try changing the security type to WPA or WPA2 and attempt to re-connect. For additional support, please contact Apple. Samsung is unable to provide support for third party devices.
I just bought a Samsung LN40B7501 LCD TV and I'm the Samsung WIS09ABGN wireless LAN adapter to connect the TV to internet via my Apple Airport Extreme but I can't get pass the Gateway Ping. I've tried many different configurations on my AirPort without any success. I would like to know what settings I should use on the AirPort Extreme to overcome this problem or alternately if there is a solution on the TV side?