Can´t see folder icons when saving a document

[Hartigan]

Hi, I´ve been having a problem for a while, let´s see if someone can help me:

When I try to save a document in my computer (Windows 7 x64) I can´t see the folder/any icon, so although I know from the name if it is a folder or not, it is quite anoying having to think it instead of simply seeing the icon.

I post a picture so you have a better understanding of the problem.

Tnak you for your help.