DanaD1, I'm an I.T. guy, and, duplicate IP addresses should never happen on a network, and assuming you have your WPA security properly setup on your network, and no nearby neighbors trying to "leach" your Internet, one simple way to get things going again would be to power off everything on the network, (I know, this stinks) but, I mean everything connected, laptops, desktops, Wii's, PS3's, DirecTv's Etc, AND the Router.
Now, #1, Power on the router, and let the lights settle down. Now, one by one, turn on each DirecTv, and go thru the Menu, Settings, Network Setup, and get each box connected to your wireless network. Then, you will be ready to connect each other device to the wireless network, i.e. your laptop, iPad, iPhone, Wii, PS3 whatever, and you should not see the duplicate IP address.
Every once in awhile, our routers need a reboot, and sometimes, this just requires giving our receives a "nudge"....that's what I've found.