You didn't tell much about the router setup. Models, settings matter here but let's cover the usual.
You'll want to have the router setup to:
1. The ISP settings and the rest the router defaults.
2. Broadcast SSID
3. Use WPA but no other items such as MAC filters.
Sorry but the router setup, make, models are things I couldn't find in your post so I can only offer the usual.
I have just bought a laptop for my wife and when she attempts to connect to the internet through the wireless card installed on her laptop it comes up with the message "Aquiring a network address" it does this several times and never gets one. My laptop has no problem aquiring a network address wirelessly through the same router. The signal strenth is excellent. I also have this problem with MY laptop when I go to my mothers house. I have a Netgear router and my provider is with Sky Broadband (as is my mother) please help!!