Unable to install drives for Arduino UNORev3.

Hi, I am facing difficulties in installing the drivers for the Arduino Uno Rev3. Firstly the when I download the Arduino 1.0.2, I get an error "Could not read color theme settings. You'll need to reinstall Processing." So I download an Enhanced release Arduino ERW 1.0.2. This time it works fine.

After connecting my Arduino Uno board, I proceed to Device manager and try to update the driver manually but i get "Third-party INF does not contain digital signature information."

I have attached some screen-shots of the errors. Please Help!
Thanks.

3rdparty.JPG

Which operating system is that?