Can no longer connect to encripted wireless.

Hello,
I am running a wired and WPA TKIP Encripted wireless network through a WRT350N and Netopia DSL modem. I have a Western Digital Mybook Premium 500GB hard drive connected for storage.
The system had included 2 XP Home PCs one using a Linksys WMP54GS Wireless PCI adapter and the other using a Netgear “G” USB adapter configured through Windows since the Netgear software would only do WEP.  There are also 2 laptops one being an older model with the Linksys “G” PCMCIA and a newer Core2Duo using Intel Proset.
February I built a New PC which I connected via CAT5 which required moving the WRT350N, modem and 500GB MyBook into the computer room. In this room we also have our Dual mode 2.4 Ghz Linksys CIT300 Skype phone and our 2.4Ghz main phone. The new PC also has a Logitech G7 mouse using 2.4Ghz wireless. Everything ran smoothly for just over a month.
 Around the same time as the start of the network connection Issues I swapped the Motherboard in the New PC with an SLI version and set the machine back up still using CAT5 and no wireless.
I cannot say for certain that we didn’t have any issues before the time of the swap but it did become very noticeable around the same time and I just want to cover all the bases.
What happened is the wireless PCs slowed down a bit and then the Netgear connected PC started to have disconnect issues that were very noticeable since it was the machine that pulls our e-mail. We then noticed the Linksys G Desktop having connection speed issues and then finally all the wireless machines will no longer connect via encrypted wireless at all. If I reset the Router they connect without a problem. I can change the SSID and turn off the SSID Broadcast without a problem but the moment I turn on WPA Personal, TKIP, and set a password they all lose connection and will refuse to connect. I have sat down at each machine and deleted the wireless profiles and set them up with all the same SSID, Security, and keys but they will not connect.
I even ran Net Stumbler on my Laptop to look for other wireless networks but only find one on Channel 11. Mine shows up too but at Channel 1 using the 40Mhz channel. Network mode is set to Mixed, Radio band is auto, Wide Channel is auto, Standard channel is also Auto.  
Is there anything else I may be missing? I have reset the router many times and have tried restoring from saved configurations but nothing works at all. The only thing that works now is the wired connection. L
I sure hope Linksys reads these forums because they sure do not read their tech support e-mails!
I look forward to any help.
Thanks,
Martin

First of all, re-download and re-install the latest firmware for your router.  After installing the latest firmware, make sure you reset the router to factory defaults, then set up the router from scratch.
Next, make sure you have a unique SSID (don't use "linksys" ), and turn on SSID broadcast.  Turning on SSID broadcast makes it easier for your computers to find and stay connected to your router.   I used to recommend that SSID broadcast be turned off for security reasons, but this is no longer required because new "cracking" techniques have made this old trick useless.
As a test, turn off all your 2.4 GHz devices and unplug them from the wall.  This would include your phones, wireless mouse, and any Bluetooth, wireless baby monitors, microwave ovens, wireless keyboards, etc.   Also, turn off any 5+ GHz phones, as some of these also use the 2.4 GHz band.   See if this makes a difference.
Since your Netgear "would only do WEP", I don't understand how you ever got it to work before with WPA encryption.  Please explain.  Are you saying that the Windows software was doing the WPA for you? 
Update you computers with the latest drivers for your wireless adapters.
As infinityx mentioned, update Windows XP to at least SP2.
It sounds like you may have the Intel Pro Wireless 2200bg card.  If so, this card is known to have connection problems.  The problems with this card worsened with a recent Windows update, but were fixed with the latest driver.  Go to the Intel web site and download and install the latest drivers.
Also, you can try another channel on your router.  Since you have a neighbor on 11, try any channel 1 thru 6.  (Always try to stay at least +5 or -5 channels from your strongest neighbors.).
Message Edited by toomanydonuts on 03-16-200704:01 AM

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