Can you set one computer on a wireless network to have a higher bandwidth than the others on the network?

I have a wireless network in my flat and a laptop that i play internet games on - but now i cant as i have a flat mate who moved in with acomputer and the games run to slow to play - its a 4meg broadband line but it still runs slow - is there a way to prioritise my computer in terms of bandwidth?
Answer
Go into your router and set up mac address protection and lock him out of your network.