Suddenly unable to connect to home network

My new Macbook 2.0Ghz recognised our home wireless network within seconds of being set up, and has worked fine for 2 days. But today it is no longer connecting.
The network appears under the airport icon in the menu bar, but when I click on it an alert box comes up after about 20 seconds saying ‘There was an error joining the airport network Netgear.’
According to Network Diagnostics, all the network systems have failed. The Network icon in the Finder side bar no longer shows a server, and the System Profiler says ‘Wireless network not available’.
We have 2 other Macs in the house, and they are both working fine. Any ideas about what’s suddenly gone wrong with my new Macbook, and how to fix it?
Many thanks in advance for any help you can provide.

I don't want to start fiddling around with the hardware on my new machine, Rick, but I've tried a few other things.
I changed the channel on my router from 11 to 3 this morning, and it appeared to work - suddenly I could connect straight away, even with all the other computers using the internet. However, when I started my macbook up later on, it did not connect.
It does seem that if I reboot the router and go online first (ie. with the other computers switched off), I can connect. But obviously that's not a proper fix!
I've also downloaded iStumbler on all the computers, and it shows 0% noise for the connection on the others, but 9% on my macbook. I don't know if this is perhaps affecting my connection?
I've also tried resetting the network settings (by removing the SystemConfiguration folder) and manually configuring my connection, but with no success.
Has any one got any ideas?

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