My wii and my laptop no longer are able to connect wirelessly

The wii should never be connected to your TiVo directly. The Wii gets connected to your television.

Make sure you have created a NEW internet connection in your Wii System settings. Since you have changed your service, your old connection settings will no longer work. Go to your system settings from your main Wii menu, and select internet connection to set up a new one.
If you have already tried to set up a new connection and still cannot connect to the internet, make sure your router security settings allow your Wii to connect to your wireless internet.

You can't, unless you buy a Wii LAN adapter.

Info HERE

Delete the connection in the settings and start fresh. Good Luck!

reboot your router

there is a problem with your WEP key, means the password which is used to enter your router or network. simply delete the network from the network list and connect to the network again and insert the correct shared key.

On the Wii console's main menu, click on the 'Wii button' in the lower left corner, then 'Wii Settings' then 'Internet' button, Select 'Connection Settings' you should see your wireless connection and be able to edit the password or just set-up a new connection by choosing 'connection 3'

unplug for 10 seconds, plug back in. These units to tend to get a stat build up charge

reset the device.reconfigure it again with proper settings and be cautious that wifi settings match your Nintendo wii

does the wii see the router do you have a laptop to make sure its sending a signal try this dis connect everything plug in the modem let it symc up by it self then plug in the router and hook up the cat 5 cable to the router
the try to sync the connection with the wii by searching for the router
it helps to name your router first with a laptop but that should work if not let me know iam a cable tech with a few tricks