Hi sandy, I would start with Digital Controller's suggestion of restarting the router. If that doesn't work, I've had some good luck with the application Wifi Analyzer. If you download that in the play store, you'll need to also download the connection library. When you try to connect from Wifi Analyzer, it'll prompt you to download this add on for it. Do it.
This is me guessing that maybe there is some sort of incompatibility with your setup... I was thinking maybe this 3rd party software might be able to get it going.
If that doesn't work, then I'd try the factory reset as well. But make sure you back up anything that you need, not sure if your tablet has any 'essential' files, but you'll want to save those.
Best of luck, and welcome to AF!
-9to5