Macbook Pro Snow Leopard; WiFi keeps dropping, no IP Address

Macbook Pro Snow Leopard; WiFi keeps dropping. Issue is Macbook is not getting an IP address from the wireless routers DHCP Server. Tried all options in the forums. Reboot, changing security, PRAM reset .. nothing. Problem keeps happening. No issues on XP laptops and Nokia phones.
Even the iPhone, iPod and iPad seems to be fine. It is just the dang gam it Macbook pro and it is driving me crazy.
All fixes tried, changing wireless mode, security, PRAM ... only thing left is to rebuild the mac which i was hoping I can avoid somehow.
Any ideas to fix this would be great!
RK

Change your router channel.  Sometimes this all you will have to do.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations:  Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock.  Highlight Airport.  Network Name-select your name.  Click on the Advanced button.  Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined."  Click the OK button and lock the padlock.  Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
How to diagnose and resolve Wi-Fi slow-downs

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