Thanks for the real quick response.
I tried both suggestions…
I think I have different problem.
My computer does not recognize the nano at all, it doesn't make a sound when I plug or unplug the USB, and it doesn't show the Arduino at the device manager at all.
(it's just blink)
Because i can't see the device in the device manager I could not choose the Arduino from the device manger and right click on it and install the drivers (is there any other way for doing it?).
I also tried the ERW 1.0.1 software and it doesn't recognize the port either, as before