Well I posted on a famous network and australian ISP forums to get some help, and it has seemed to work.

I had a cable running from the ADSL modem into the WAN port on the wireless router, so I was told to change the chord into just a normal port on the wireless router. Rebooted all the computers. And it works perfectly.

I get 170kb/sec download speeds on my PC and 150kb/sec on the iMAC and the laptop.