cannot connect to internet with wireless

Hi
please could anyone help. I purchased an amilo pi1505 note book a few weeks ago and still cannot connect to the internet using wireless. The main computer and the router are working and connected correctly. On my notebook i am using the built in wireless card etc. It says that i am connected and have a strong signal but cannot access the web, please please help

Check this to see if it is set correctly:

Go to Control Panel
Select Network Connections
Double click the Wireless connection Icon
Click the Properties button on the window that opens
On the General tab highlight "Internet Protocol (TCP/IP)
Click on the Properties button below it
Make sure "Obtain IP" and "Obtain DNS" are both set to "Auto" mode.
Reboot if you change them.

Hope this helps...........