Error -6753 and no internet

Hey Guys,
I have a big problem and can't solve it
I have a LG Notebook with Vista... I am in a student dorm with an ethernet network. It works if I plug the ethernet cable to my pc. But then I got an airport express to be able to use dorm internet through a wireless network. I installed the airport utility and configured settings... There are a few problems:
1) After configuration I am able to connect via wireless my computer to my airport express. But I can't have internet access (light is green, ethernet cable is plugged into airport express (If I plug it from airport express, AE gets a yellow flashing state))
2) After the first configuration AE is being unable for a few seconds (as usual) and my computer automaticle connects to it BUT I cant configure it in airport utility anymore and get an error -6753 from Airport Utility.
Maybe relevant: In summary section during the configuration there was a problem: Double NAT and in the explanation it said to change to bridge mode. I tried that as well but no change.
What can be the problem? I mean I dont have any problem with wireless connection but having internet access. There must be a problem somewhere between dormitory-network and AE wireless access?!

When you reset the AX, it should have reconfigured itself to broadcast a wireless network with a Network Name (or SSID) of something like Apple Network NNNNNN. In addition it enabled its NAT & DHCP services. Then, when you reconfigured the AX as a bridge, that should have disabled both the NAT & DHCP services, but left the wireless network enabled. In theory, any wireless device connected to the AX should be getting its IP address information from the school's router ... as this should "pass-thru" the AX directly to the client. Also, the double-NAT error should disappear.
Double-NAT problem has been solved
As a simple experiment, try entering the actual IP address of a popular Internet site, like Amazon, instead of entering the URL. For example, try entering http://72.21.207.65 in your web browser's address window. Did the Amazon.com website come up? Now, try entering http://www.amazon.com; did it show up again? If not, then your computer is not getting the DNS server information it needs from the school's router. Please post back your results.
I understand the issue with DNS but it doesn't work. With IP-Adresse or Domain-Name it doesn't matter. I can't open web pages or my windows still thinks it is local.
*More details:*
Connect Using: Ethernet (I use an ethernet cable (RJ45) to get internet from my school)
IP Address: 169.254.159.98
*Under Internet Internet Connection*
Connection Sharing: Off (Bridge Mode)
*Under Internet TCP/IP Section*
Configure IPv4: Using DHCP
IP Address: 169.254.159.98
Subnet Mask: 255.255.0.0
Router Address: 10.10.0.250
Message was edited by: Genoo

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