Right I think I might have a soulution mate, but it doe's Depend on the make of your router.
1st do you have a ethernet cable?
If you have a normal PC then take it out of that,
Then plug it directly into your laptop from the router,
It should automatically connect to the internet,
Now once connected go onto the internet address bar and type in: 192.168.1.1
Then if it asks you for a username and password there both "admin",
Then once accessed have a look at the navagation for the wireless section,
Then activate the wireless internet,
Then if you want to have a key for the wireless internet, type the same key you see on screen into your laptop/netbook, if you don't click on the drop down menu or what ever you have and choose no password.
If this does not work then please post the router make and model,
Please keep me updated on the situation,