Mac Book will no longer join wireless home network

I am having ongoing problems with getting my 2.0G black Mac Book to connect to my wireless home internet and network.
For the first six weeks I had my Mac Book it connected to the network without difficulty. I have a Belkin modem/router, a PC which connects wirelessly and also an airport express on my stereo for airtunes, which was also wirelessly connected. The network was WPA Personal encrypted.
The Mac Book will connect to other wireless networks without any difficulty.
About 3 days ago my Mac Book stopped connecting to my home network - the network name is visible in the airport list but when I tried to connect by entering the WPA password it rejected the password or it returned an "error joining the airport network". The PC and airtunes were still connecting without a problem. It was just the Mac Book that would not connect.
I adjusted the network settings to remove WPA security and the Mac Book then connected easily. However I was not happy about leaving my network unencrypted or unsecured, so I attempted to secure the network again using WPA. Once again,the PC or airtunes joining the network with WPA but the Mac Book would not accept the WPA Password.
I have read as many forum posts as I could find to get all the possible troubleshooting tips on this problem. Here's what I've tried:
1. Deleting the network from my preferred network list and deleting the password from my keychain, then adding it afresh after rebooting the router and the Mac Book
3. Renaming the ESSID to a shorter name
4. Downloading Airport Extreme Update 2007-002
5. Toggling airport on and off
6. Using the $ in front of the WPA Passkey (even though that is a fix for the WEP passwords only)
7. Removing the battery (yes, someone said it worked for them!)
I had no success in getting the Mac Book to connect to the WPA encrypted network (even though it was doing so easily last week!). I then resigned myself to removing the WPA security so that I could at least get an unsecured internet connection on the Mac Book (I was thinking I could deal with the security by hiding the ESSID and using MAC filtering - not ideal, but perhaps the next best solution).
Tonight I removed the WPA security and now the Mac Book will not even connect to the unsecured network. My network ESSID is visible in the airport menu but when I select it - I get the "error connecting to the Airport network' message. I have tried all the usual fixes again (deleting network and passwords and keychains, rebooting router and MacBook etc) but it will not connect to my network. It will, however, connect to my neighbour's unsecured network just fine.
As far as I can deduce, the problem is with how the Mac Book sees my wireless network. The PC is connecting to the network. The Mac Book is connecting to other networks. Have I muddied the waters in my Mac Book through the various fixes I have tried? If so, how can I fix it so that it connects to my unsecured network as easily as it connects to next door's?
Forget about trying to secure the network with WPA for now, I just want to get an unsecured connection at the very least.
Any help would be appreciated.

Thanks for your suggestions.
I've looked into the problem a bit further and I think I can trace it to the OS X 10.4.9 updates and the 2007-002 Airport Update downloads. My difficulties accessing the WPA network began after I downloaded the most recent OS X updates. After I downloaded 2007-002 update (designed to make it EASIER to access third party wireless routers! Joke!) I wasn't even able to connect to the unsecured network.
It appears I am not alone with this problem - many others have complained of losing connectivity after downloading these updates. There is a relatively difficult and risky way to uninstall the updates but I have reservations about messing with the OS, and I fear the same problem will arise with future updates.
Because I am now so sick of mucking around trying to fix this and there doesn't seem to be a fix on the horizon, I have solved the problem by buying an airport express and ditching the belkin router. I have now re-established the network without any problems using the airport express. So much for Macs being simple and compatible - the reality is a long way behind the impressive tv advertising.

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