I just received my r3 and I try to load something but I get always a message : avrdude: ser_send(): write error: sorry no info avail.
My system is a win 7 64. I see arduino on com5. when I try to update the driver it says that already updated at best I tried the loop back (http://forum.arduino.cc/index.php/topic,73748.0.html) and I don't get any character back. When I connect arduino I get the beep from win as for any new usb device. When I list usb devices I don't see arduino, but listing all devices and printers arduino on com 5 appears
What can I do?