Guide setup keeps popping up on digital adapter

I'm trying to help my father with his TV. He has one of the cheap digital adapters and guide setup keeps popping up so frequently you can't even watch TV. He went to the local office and swapped the adapter and the new one does the same. To make it even more confusing he has the same digital adapter on a different TV in the house and tried swapping those but it's still popping up on his TV. It makes no sense. I would think it would have something to do with the cable line going to that room but I would think if there was a problem you wouldn't get any picture. Anybody have any idea what to do to fix this?