Oh god, I really hate vista now I realize why Microsoft wants to bury that chapter on his history.
Configuring a Vista Laptop at work the device couldn’t obtain an IP Address from the router, instead of trying to it just complains the device stays in an Identifying.. status and you can not connect to the network.
Certain types of router do not support the DHCP Broadcast Flag, or the option is intencionally turned off for security purposes, so according to microsoft what you need to do is setup this manually in the registry.
For the end-user this is the last thing you think about! What a piece of junk.