Vista, ICS and a PS2

> Ok, something is FUBAR with Vista, Wireless networking and a PS2
> I constantly get "connected with limited connectivity" while in the obove
> situation.
> Running through a wireless router with NO security OTHER than mac address
> only.
> I get piss poor lag while trying to play games.
>
> I can be connected at 54mbps, and as soon as the PS2 connects it drops
> between 18-11mbps.
> after about 30minutes or so, the dreaded "connected with limited
> connectivity".
> I have tried two different routers and the same thing, so that tells me it
> it freakin Vista.
>
> any ideas?