Hello Helen, welcome to Android Forums!
Are you talking about downloading these things from the Google Play store? If so, there are a couple of things you might want to try. First, take your tablet to a public WiFi area to see if you can download from there. We need to know if it's a problem with your home wifi network or a setting on the tablet. You should also check your router to make sure port 5226 is open, which is the port that the play store uses.
I am going to assume that the other network functions like email and internet are all working for you.
If you are trying to get apps from a different source, give us some of the details so we can take a look at it for you.