I got my 360 a few weeks ago, it's been working fine but today the internet for it shut off and when I tried to edit it, it won't let me put in a WPA key but only WEP because WPA is grayed out ( I have WPA ) I tried restarting and doing "Initial Setup" but nothing would let me put WPA keys in.
Are you sure the router has been reset to WEP for some reason ? Do the other computers connect to the router using WPA ?
I found out what the problem was and I feel really stupid now :haha: Apparently I still had my friend's internet settings on my xbox for when I went to his house, I just needed to delete it and switch back to WPA :haha: