I have my audio receiver connected to my pc via a toslink cable. While i was running window 8.1 i was able go to the sound properties select the Realtek Digital Output and configure my speaker to 5.1. Now after upgrading to windows 10 and downloading the windows 10 audio drivers i can no longer select configure it is greyed out and now my speakers only play in stereo. Also, i cannot go to the Realtek HD Audio Manager under control panel and enable DTS Neo because the speakers are not set to 5.1.

My mother board is a Z97 Extreme 6.