Android Question

I am trying to install some apps on a Hannspree 10.1 tablet. I go to the Google Play store and choose some such as Candy Sage and Angry Birds. It says it is installing them, but they don't show up on the apps page. when I click on them on the setting page undr apps, a picture of them comes up, but they don't run. It says it is in "safe mode" but there is no way to change that that I can find. Is this just unworkable junk that I can return?