problem with drivers

I’m having a bit of a problem with the driver installation. I bought a Duemilenova, connected it to the pc but the drivers are not installed. I connected it first time and it didn’t install the driver automatically. So I tried to manually install the drivers using the device manager, but it’s still not working. It just says “windows could not find the software that controls the device” (something like that, my pc is in another language).

The board itself seems to be responsive, the pwr led is on and there's another orange led that is blinking. btw in the device manager the board appears with the name “FT232R USB UART” and I'm using windows 7.