Midi keyboard sustains note after key is depressed
According to my research of your problem (and I do not have have your set up to confirm).

Not sure what did you do to break something else aside of the cable, but following instructions might help.

Since the Yamaha is wrongly identified as VIEWCON lets hope it is just the Driver (software)

Follow the instructions here to remedy the problem.

Pay attention to the section how to remove and reinstall. (page 7)