MEGA2560 Installation (vista) : No driver found...

On plugging in the device from new, my VISTA PC will search for driver and fail
It says insert disc, which I dont have...

Now I am stuck, I have read the trubbleshoooting guide and found no specific answer

I have tried to update the driver directly from Device manager and that searched the internet and found Nothing !

HELP ! please

Ta. Bob

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

Thank you :@)