Computer wireless connection

My other computer has stopped accessing the net now and I'm reduced to going to the library! It has a wireless connection, but it suddenly stopped accessing the internet even though the little icon in the bottom right hand corner of the screen says it is connected and I can't find evidence of any viruses on it. Does anyone know what is wrong with it?

try this.

the internet cavle is unhooked, and you need to turn off the power to it and then re-hook the cables all over again to the wireless router.

Or try using Firefox. Somehow my Nortons managed to block IE..

Thanks.