What does Windows device manager say about the device when you plug it in? Any yellow exclamation marks?
What are the VID and the PID; in case you don't know how to find them, see Cannot upload to my brand-new Arduino Nano - #12 by sterretje to find them.
If Windows device manager does not see the board at all, you might have a bad cable or it might not have been inserted properly at one or both sides.