DHCP not working Help Me!!!

OK I have Have a MacBookPro dual booting with Windows. I am trying to connect to my wireless router through DHCP and have WPA security enabled on the router.
I can not get OSX to connect wireless using DHCP. It works fine if I assign a static IP or if I boot into windows I will get an IP address. OSX will just assign a 169.254.?.? ip address (APIPA). If I try an unsecure network DHCP has not problems and will get an ip address.
I have tried deleting my network and recreating it. Also tried deleting my passkeys will no good results.
This all started after the rollout of 10.4.7 and the security update afterwards did not fix my issues.
I need a network expert!!!
MacBookPro   Mac OS X (10.4.7)  

OK I got tied of waiting for an answer or just a responce so I figured it out for myself.
I turned the wireless security off on my router and DHCP connects fine. So I started thinking let me try WPA2. Oh my gosh .... That Fu#@ing worked! The only problem is that I have other wireless equipment that does not support WPA2 yet.
If any one knows why my WPA security settings do not support DHCP anymore I would really like to know. For now I guess being extra secure won't hurt.
Thanks for all the help everyone.

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