My guess is that the problem lies with your router/WiFi. It could be the type of security, the channel you're using or something as simple as restarting the router. I have additional WiFi connection issue tips in a link below.
If you use Wifi then you will need your internet hub Wireless network/SSID code and Wireless key code for it to work on a tablet or you could could do what "leeshor" said with his links