Unable to install driver for arduino board

I am using ans arduino uno with Windows 7

When I plug my board into m computer, it comes up as an unrecognized device. I try to fix this by assigning a driver to it, but when I try to the driver won't show up. Only the folders in the drivers folder appear. What can I do in order to fix this so that I can upload sketches to my board?

Try http://arduino.cc/forum/index.php/topic,118440.0.html

If that does not work, probably there is a problem with the cable/board itself.