Wifi can't find my router

Archived from groups: microsoft.public.windows.networking.wireless (More info?)

I had a strange problem today. Yesterday i buy a new notebook, It was possible to go on the internet, wireless; And today, it wasn't possible, my notebook can't make a wireless connection with my router. With a network cable is it no problem, but i can't do i wireless.
And if i look to my hardware, there's written that the hardware function perfectly. And it's not something on the router, because I can make a wireless connection with my other pc.
Somebody has a solution?
thanx