Can't get 2 macs on same network!

Hi all,
I've got a netgear router that's worked perfectly for the last 2 years (connected to a PC) with a sole user (me) on the wireless network.
We've now got a MacBook Pro in the house aswell, and there's a problem. We can't connect to the network wirelessly simultaneously. I have to power the netgear down to 'break' the connection to the MB, and then the MBP will work. I've got WPA set up, and the key does work on both books, but with the above problem.
Does anyone know whether this is mac-related (i.e. system preferences), or router problem??
Please help!!
Thanks,
Farhan
MacBook 2ghz (C2D), MacBook Pro 2.16ghz Mac OS X (10.4.9) Netgear DG834G router

Assuming that either your MB or MBP can connect to the Netgear individually, then it must be a router problem. There is no way it should not handle multiple, and many more than 2, connections. What model Netgear is it? Look up your exact model on the Netgear website and download and install the latest firmware for it.
But first, review the settings for the DHCP Server in your Netgear and make sure that the range of addresses is > 1, fr example 192.168.0.50 ... 192.168.0.100 or similar

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