Hey man, just solved the issue.. Go to the dell driver page for your system, select win 8.1 from O.S. and download Sound drivers..Uninstall the one from device manager and install the one you downloaded..This fixed my problem, recon control panel is working now and sound is back to normal.. 
Hi there, My headphones were not recognized when plugged in like before so i decided to delete the driver and restart Windows..The drivers are reloaded, headphones are working when plugged in. But Recon 3Di control panel fails to see the device as supported.. Any advices ?
Sound Problem After Win 10 update !!