Girlfriend's computer can't connect to Express network with password-help!

Hi, first post here so please be gentle with me!
I have an Airport Express router which is working fine with my MBP running Leopard. Last week, my girlfriend got a new white MacBook but this new computer is unable to join my network when it is password-protected - I just keep on getting a message saying 'connection timeout' when I try and join the network. It works fine when I remove the password protection for the network, but this is hardly ideal because my network is then completely unsecured and anyone can join (I live in a block of flats). Also, whilst password protection is in place the problematic computer cannot find the Airport Express using Airport Utility, so I would be unable to make any changes if my computer was unavailable. I would be grateful for any guidance or help to resolve these issues as I want my network secure again!
Finally, I've noticed throughout my experimentation with security settings that my internet speeds are noticably improved when my wireless network is unsecure - has anyone else noticed this, and is the problem fixable?
Many thanks in advance for any advice.

I've downloaded Air Radar and our wireless network is on a separate channel to everyone else's and is apparently mostly running OK (although at one point last night it totally went dead and I just turned everything off in frustration). I've tried to simply put everything back to how it was before the problem started by making the network open and unprotected, which (after unplugging the modem and the Airport Express overnight and starting again this morning) seems to have helped on my computer, even though the internet is running slower than it was last week when everything was fine for both computers.
However, my girlfriends computer still won't connect to the internet. Last night it appeared to be because Airport on her computer had a self-assigned IP address which prevented the computer connecting to the internet - today I have turned off the Firewall and flushed the ipfw cache and although initially I could join the network (although not access the internet) it has just dropped the connection. Network diagnostics won't help because when it scans it doesn't appear to find any networks - just keeps scanning indefinitely.
I'm getting to the point now where I'm thinking of just formatting the hard disk and reinstalling the OS and starting again, unless anyone can offer any better suggestions?
Thanks in advance for any help!

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