DNS and Key Ports problem

[lynda_m]

I use the internet on my laptop via a wireless network and all has been fine up until this morning when I couldn't log in to messengeror get on to the internet.

It says the wireless network is connected but every time I try to log on to MSN messenger or use the net it says cannot connect or page not found.

Have used the troubleshooting on messenger and this flags up DNS and Key Ports. I have tried using run -> cmd -> ipconfig/all, ipconfig/refresh, ipconfig/renew etc and I still can't get on to the internet or messenger... any ideas anyone?

Thanks in advance