pert:
Are you certain that COM3 is the port of your USB-serial adapter? You can test that by unplugging the usb cable, wait a little while, then check if the COM port has disappeared from the Tools > Port menu.
Yes I have the Device Manger working and it shows COM 3
I also have been using the Serial Monitor and doing a loopback test and can see all the text that I type displayed on its screen