My Macbook doesn't find my AirPort wireless network anymore

I have a strange problem with my Macbook and/or AirPort Express. This combination has worked fine until now, but yesterday the Macbook suddenly couldn't find the network anymore. This happened while I was surfing. I haven't installed any programs recently or changed any settings.
When I click on the AirPort-icon it lists all my neighbours networks, but not mine. I have no problems connecting to other networks, I have successfully tried this both at work and some of my neighbours networks.
My old Dell Windows PC however have no problems finding and connecting to my network! I'm using it right now. So it's just the combination Macbook and AirPort Express that's problematic.
Things I have tried unsuccessfully:
- Restarting the Macbook, my cable modem and the AirPort Express (numerous times and in different orders)
- "Join Other Network" and entered the name of the network and password manually. This only results in an "Connection timeout"-error message.
- Deleted the network name from "Preferred Networks". This made the Macbook actually list my network for a few seconds every time I restart or turn AirPort off and on again. It disappears again very quickly and I can't connect to it.
- Changing security, I have tried open, WEP and WPA.
- Factory reset of the AirPort Express and creating a new wireless network with a new name. I had to do this on the Windows PC because the Macbook didn't find it. I was even able to connect to this network with the Macbook for a little while. It wasn't listed in the network list, but I could connect via Join Other Network. Unfortunately it only lasted until the Macbook went to sleep. Since then I haven't been able to connect to the network and I can only see it for a few seconds every time I restart. The Dell Windows PC has no problems with this network.
I have no idea what the problem is or whether the problem is the Macbook or the AirPort Express since they both work fine separately.
Any ideas for things I haven't tried?
Message was edited by: Solvi

I'm having the same problems recently. Bought my white MacBook in Jan. '09, worked great for several months; now it won't stay on the Internet for more than five minutes at a time unless I'm right next to the router. The Airport icon, when selected, shows my network but for some reason it has been deselected. My husband's Dell has no problem at all, even if he's out on the back porch, so it's not a signal issue.
I've updated the software to the latest Airport but that seems to have made it worse. I've tried nearly all the things Solvi did to no avail. Has there been an answer yet from Apple on this?
(Had to re-select network to sent this short post!!)

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