Wifi Does Not detect my network but does others

Hi there,
I managed to get great responses last time I had an issue and now I'm back.
Here's the issue and I will also say what I've tried so far to fix it.
ISSUE
On-and-off my laptop cannot detect (and hence join) my own Wi-Fi network, even when right next to the router. My neighbours' networks are all visible.
This issue is not consistent and is sporadic.
It is not a hardware issue - I'm currently (reluctantly) logged into my Windows partition and am happily using my Wi-Fi connection through that.
It's not a router issue as
a) It's a new router
b) I can connect through Windows (as can my wife on her netbook)
c) My iPod Touch connects no problem.
My network is not a hidden network, it is fully visible. It is, of course, a secured network and no-one but me knows the password to the admin panel of the network.
_WHAT I'VE TRIED_
a) Restarting the computer doesn't fix it
b) Removing the connection settings from 'Networks' and restarting it doesn't fix it
c) Deleting the system preferences list from Library|SystemConfig|Preferences doesn't fit it.
d) Turning the router off for a while and then back on doesn't fix it.
e) I've just done a DiskWarrior check and that didn't fix it.
I have also done a complete reinstall of Leopard and then restored my files etc from my external hard drive (configured to use Time Machine).
I don't know whether I've covered everything, but it's certainly a start.
A couple of weird things - sometimes leaving it overnight means it re-finds my network - but no explanations. And the fact that this issue is inconsistent.
Please help, as I really am getting tired of it (I've tried working around it for a couple of weeks now) and am out of ideas.
Many thanks in advance,
Martin

Hi Martin,
It sounds to me like an IP address problem.
Under "Applications" go to "System preferences", then under "Internet & Network" select "Network" Select the kind of network you want to connect to, go to advanced under "TCP/IP" It should say "Using DHCP"
Write down the IP address.
Try renewing the DHCP lease. Then try connecting to the network.
If that doesn't work, find a computer that can connect to the internet and check the IP address of that computer the first three sets of numbers should match the IP address you wrote down, if they don't normally I would have to tell you to go through terminal and find an unused IP address to select, but considering you probably are never going to access the network through both parts of the partition at the same time, you can safely use the IP address that Windows has. How to get that IP Address I can't really help you with though...
Once you pull the IP address that the windows side is using go back to the advanced settings page and select "use DHCP with manual IP address" in the space for IP address enter said IP address, and click apply. And hopefully you will be having a grand ol' time on the web.

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