cathyy, It sounds like you might be using a TiVo N adapter to connect to your Wireless Network.
If so please see these instructions:
You will need process a factory reset to the adapter. You can do this by pressing a paper clip into the hole in the bottom of the adapter until the power light turns from green to amber (orange). Then allow the power light to change back to green before tryint to launch the N adapter wizard, instructions to follw.