can't hear the audio after record the voice and after not able to any of audio files in my pc, why?

(can't hear the audio after record the voice and after not able to any of audio files in my pc, why?)

recently ive reinstalled my windows with latest update. after install the Studio One i can record voice but not able to hear when playback. that time can't hear when i play other player in my pc (media player & youtube) , why?