I have a someone with a similar problem where I can only establish a wireless conection with their new HP L/top if I manually connect. When restart Laptop the wireless connection is Ltd Access.
Changing the ports is not recomended as loads of stuff can get in. oh and also this is a vista laptop.
Proved by turning off Norton Firewall for a time to reboot proved it. Is your wirless adapter a Broadcom brand on the laptop ?
I have only just started looking into this problem so will call back when I have more info