Why won't my Devices connect to my home Wi-Fi?

My HP Touchpad, Blackberry Torch and my moms Kobo and iPhone 4 won't connect to our home Wi-Fi.our computer and my iPod are fine. When we try to connect it say it can't find the IP address. They all work on other networks.
We have a WEP network, or something like that.

Try switching on sharing in media player (in library tab) map network drive and see if they show up on our computer

Don't use WEP encryption, it's so vulnerable. You should try to configure WPA2 or WPA encryption on wireless router, and test to connect from your mobile devices again. This is an example of wireless router configuration example, feel free to have a look: http://www.home-network-help.com/wireless-router.html

Hope this helps.

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