Question : How do I change the passphrase for a wireless network without changing the SSID in windows vista.

I have been using my vista laptop with a wireless network.
SSID: home_network
Passphrase: #########

This network failed and was replaced with another unit using the same SSID but a different passphrase.

New system:
SSID: home_network
Passphrase: #XXXXXXXX

Every time I try to change this passphrase in my vista system it tells me that I will have to change to another network name {SSID}. If I do that - there is no other network and  If I refuse to change the name it reverts to trying to login to the SSID with the original passphrase.
 
Could someone with more experience please provide some devine guidance - -
I have already invoked colorful expressions from the nether world which had no effect on the problem..

Answer : How do I change the passphrase for a wireless network without changing the SSID in windows vista.

I've had situations where I'd typed the wrong passphrase in at both ends (repeated typo) and then a 3rd box would not connect with the "correct" one.  But, it sounds like you didn't set the router end passphrase.

Another possibility is your firewall on the computer.  But, I think this is less likely than a passphrase and mode issue.  Make sure it's WPA2.

If this works with a static IP on the computer then maybe there aren't enough DCHP addresses to go around and they are all leased out?