Cameras and photography?

My mom has a nikon dslr D3000. I understand there's never anything wrong with the camera but the person who's using it. But, the photo quality on it is extremely fuzzy. I know it can be adjusted or fixed and I just wanted to know if anyone else has had this problem or knows how to fix it. I don't remember the camera coming with bad photo quality so I think my dad may have done something(he's clueless when it comes to cameras) and my mom might have also, help?

Rest to the factory settings and start from there.

It came with a very nice owners manual.