Smoothing issue in blender 2.57

After finding this
I decided to see if I could model that image.I downloaded this model of Chell to go with my own companion cube model. However when imported it into blender it was not smooth. When I try to smooth it from the panel on the right hand side nothing happens and when I try the smooth modifier I get this:

This also happens when I render the image

Anybody have any idea what is going on?

Try using a subsurf modifier instead of smooth.

The same thing happens with the subsurf modifier.

Go into edit mode and hit Remove Doubles.

Thank you.

Make sure the shading is on smooth, first. The if it still isn’t smooth enough, remove doubles and try a subsurf.