Grey Boxes & Daz to Blender
Greetings!
I'm new and my english is bad, so my apologize for some mistake.
First problem:
I've installed the program, downloaded a model, and I've got the model, with grey boxes/cubes... (probably texture missing)
Second problem:
I've used the Daz to Blender addon, and worked, but the head is separated from the body, and the armature doesn't moved with the body.
How can I fix these problems? :C

Comments
For your first problem, you have selected bounding box for the viewport.
On the top of the viewport, left for where it says 'Perspective view', there is a box. Click on that will open a menu where you can select something different, e.g. texture shaded.
For your second question. I don't use the Daz to blender addon, and you might get better help in the Blender subforum.