|If your WLAN connection is managed by windows, you have to go to the Wireless Connection properties. There you'll find the option to configure the appropiate settings.|
If WEP is enabled at the router, you also need to enable WEP at your Wireless Connection. Therefore you need to know the WEB Key.
In IE you only have to check, whether IE should use your dialup connection automatically.
It shouldn't !!!
Please send a reply, if you solved the problem !!!