Since you do not expect to use the ethernet (LAN) any time soon you could go into Network Connections - right click on the ethernet connection - Disable. That's not going to fix any problem, but will make the non-used ethernet disappear from any ipconfig output or error messages. Just remember to Enable it again when/if you want to use it.
Reboot your PC and try again to connect to your wireless network. If unsuccessful please show ...
Start, Run, CMD, OK to open a command prompt:
(For Vista type CMD in the Search box after Start)
Type the following command:
IPCONFIG /ALL
[Note that there is no space between the slash and ALL.]
Right click in the command window and choose Select All, then hit Enter.
Paste the results in a message here.
If necessary use a text file and removable media to copy the results to a computer with internet access.