First arduino... Nano v3 + win8 x64 = flashing d13 led and device not installing

Hi,

This is my first arduino experience and I feel like a newb to micros again....

I just got my nano v3 today, installed the arduino env, plugged it in, heard the attached device sound, but no popup.

In device manager I see COM 3 under ports, but no arduino.

I did a load of googling read a load of things, tried removing the arduino env and installing the enhanced version and got the same, no device and just d13 led blinking?

Any ideas?

Andy