Problem installation arduino uno driver

Hi everyone
I have so much problem during the installation of my arduino driver
My computer don't recognize the arduino uno (Unknown Device)
When i try to install the driver this message error Appears
http://www.hostingpics.net/viewer.php?id=234740arduinodrivererror.png
(It's write that the driver is found but they is an error for install it)
I have try so many things but nothing work, please help me.

(Sorry for my bad english)