Wireless connection problem

I had this problem some months ago, I fixed it but forgot what I did to fix it.

On Monday I was able to connect to the internet with my wireless w/o a problem on my laptop. Wednesday the wireless would not connect.

The wireless shows 100% signal strength, 54mbs but will not connect. Error message: wireless network connection limited or no connectivity.

The ip address and default gateway have the same address.

No problems with a wired connection.

Any thoughts and suggestions.

Thank you