If you connect the computer to the router , it works.
That means the wired connection is OK.
Open the set up page of the router check the wireless settings of the router.
I think your network is secured and you are not typing the correct network key.
just open the router set up and check the wireless settings .
Make sure that the DHCP server on the router is enabled
Click Here for step by step solution
What OS are you using? XP/Vista?
Sometimes windows will give a false positive when trying to detect an internet connection going through some routers. If the pop-up comes up on and off it could be a weak connection or if another computer is hooked up possibly a network collision.
Check your ip address and make sure its a 192.168 or 10.x.x and not the 269.254.x.x ip givin by windows.
If you can surf the internet fine, and everything is working more then likely its a false positive created by windows. Make sure you have the latest updates and service packs installed as well.
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