There may be a change since the last post. I had the error message "avrdude: stk500_getsync(): not in sync: resp 0x00". Solved it by going to [windows 7 64 bit] control panel > device manager. When I plugged in arduino UNO to USB, an unknown device was listed. You have to install a device driver. I clicked on unknown device, clicked on driver, install new driver > find driver on my computer > went to where arduino software was installed. followed the link to driver, and it found the driver. Installed the arduino device as COM3.