Need help with wireless internet on a Fujitsu laptop.

Hi first off i know your gonna need a lot more info than i'm gonna give you so could you please suggest what else i need to include?

Ok well basically i was just surfing the net and then my internet went off (Wireless). I tried getting it back on and restarted my laptop and stuff but nothing happened. I plugged in a LAN cable but that didn't give acess to the internet. I could connect to the wireless ata first just not the internet and i could connect to a network with the LAN just not the internet. Now i can't even connect to the wireless. At first i could activate wireless just it wouldn't do much now i press the hot keys to activate it and nothing happens. As far as i'm aware thats the only way to activate it. My dads laptop is still working on the network so i think it's my computer.

I'm using a Fujitsu Siemens Amilo Laptop with Vista. I'm not sure what else to include here :S