Vista - connected but not connected

Hi all, my problem today is that after formatting my laptop i am unable to access the internet via my wireless router. When i plug the ethernet cable into my laptop no problem i can surf away. But when i take it out and put it into my wireless router which up until yesterday worked fine i can't. The strange thing is my laptop is detecting the router and wireless network but won't allow me to go online. The two monitors in the bottom right of the screen on the taskbar are illuminated but the globe is not there. I am really stuck so i just hope someonr can help me.

Regards Andy.