Trying to get 2 macs on to the same wireless network..?

Hello,
Never used to have a problem, but since upgrading 2 macs to Leopard and then Snow Leopard, they both seem to 'fight' to get on to our wireless network. One will work fine, but as soon as the 2nd book is opened, it seems to 'jam' the first, and neither can get on.
I'm running a regular BT Voyager 205 router, and am creating the network via a TimeCapsule.
Any thoughts? Are there some boxes I've failed to tick?
Thanks in advance
GUy

To check that your Time Capsule work:
1- is the status light green?
2- when you select the airport icon on the top right of your screen, can you see your network name?
3- are you able to connect to the internet trough the TC?
4- are you able to utilize the hard drive inside the TC? (does it appear in the Finder under Shared)
The wireless network you are connecting to; is this a GuestNetwork setup on the TC? GuestNetworks can be configures so that clients connecting to it are unable to communicate (this can be changed).
Check the System Preferences > Security > Firewall on both machines, if they are set to Block all incoming connections you will not be able to connect.
Check the System Preferences > Sharing, make sure the correct services are checked.
Open Network Utility > Port scan, see if the ports belonging to the services you are trying to use are open.

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