Have you tried pressing '6' with your mouse above the viewport in which you'd like to see the texture?

1, 2, 3 are for the degree of smoothness that a selected nurbs/subd object will be displayed,

while 4,5,6,7 are for wireframe, smooth, textured and lit display modes of all objects in the panel your mouse is above when you hit the keys.

You can also turn on texturing by using the menu at the top of exach panel, though I forget 'zactly how you get there and I'm away from my own pc at the moment.

hope this helps.
-S.