It may be obvious to many but not all so I am posting this suggestion.
On the far right of Windows Taskbar you will see a little USB Icon with a green background and a white check mark. (Unless you have changed the Windows Theam).
Can I suggest… USE IT! <-----------------
I have had many problems with my windows 7 64 bit when using USB. Especially when using my Gadgeteer mainboards.
I have now made it a point to ALWAYS use the ‘Safely Remove Hardware and Eject Media’
You will see your device and select it.
Example: Eject G400
I have had ZERO USB problems since I have made it a habit to Eject my device before shutting down Windows and/or before removing the Gadgeteer device USB cable.
Just something I should have always done but did not. Now I DO!