[UrbanFox]

Try: ipconfig /renew, then check if you are assigned the correct ip address, ipconfig /all and check the address for the wireless adapter.
Also, you don't say which router you have, check the range of ip addresses that are set, i.e. 194.168.0.0 to 194.168.0.30. Check if the above is somewhere in that range, yours may be different. You can also try reserving the ip address in your router for the laptop, you will need its name and mac address to do that and set it to say, 194.168.21. One more is to try connecting to an open link with your wireless password diabled then again if thats sucessful with it enabled. I have had some sucess doing that in the past when i could't get onto the internet but connected to the router.