Wi-Fi no internet connection regardless of OS

Quick summary. Internet was working fine up until 2 weeks ago. The wi-fi pizza slice has the whole '!' thing going on whilst im in Mavericks.

The problem is that it also doesn't work when i boot into my windows partition.

Now i thought the problem could be with the router but due to the setup in my girlfriends university block its just acting as a Wireless Access Point.

I have an early 08 macbook alu-unibody.

Everything else can connect to the internet through Wi-Fi without issue

.Girlfriends Laptop (not a macbook)

.My Iphone 4s

.Her Motorolla G

.PS3

.3DS

.PSP

So as far as i can tell the problem must be in my macbook somewhere. It seems like the DHCP is giving it the wrong address. Everything else on the network has the ip 172.24.1.XXX whereas my macbook gets given 192.168.1.XXX.

I have tried so far.

.Booting into Windows 7 (Same problem)

.Resetting PRAM and SMC

.Restoring WNR2200 (wireless router) to factory settings and setting up as W.A.P again.

.Changing the wireless password and router name.

.Changing Wireless Channel.

.Manually entering the internet settings. (Gets rid of the '!' but still not internet)

So i'm kinda stumped..... Help would be greatly appreciated.

EDIT: I CAN connect to the internet through a W.A.P near me (on the same network) that doesn't have a password. It would appear this assigns me an IP that works.