Hi Christy, Welcome to MixVibes.
The issue is related to the use of MIDI via USB in W8.1.
First check of envivo has any updates (driver/firmware or such). To my best knowledge the controller isn't sold as W8 compatible...
Still some hope...
Remove the driver for MIDI.
Reconnect the controller to your USB2.0 port.....
Most controllers are class compliant which mean the driver 'installs' direct from the device.
If still no luck:
you can check
http://answers.microsoft.com/en-us/wind ... b9e?page=4find reply of Eliyas Yakub [MSFT] 1/10/2014 3:17:10 AM
Another that might be of interest (found further in the story over there)
http://blogs.msdn.com/b/usbcoreblog/arc ... -port.aspxHope this is of any help...