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Its possible Windows is automatically using a Microsoft supplied driver or a generic one instead of the one from Trust.
Check under hardware manager and try manually updating the driver to the correct one from Trust.
Installation seems very straight forward, so there shouldn't be any issues, but obviously there are.
I'm not sure if the USB2.0 is an issue or not, but regardless, it should install properly on the 9400 no problems.
Otherwise, try exchanging the unit.
Best of luck
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