unistalll

CAN SOMEBODY HELP ME, I UNISTALL THE PROGRAM FOR OBVIOUS REASONS AND NOW I CANT USE MY WEB CAM EXAMPLE: FACEBOOK FOR VIDEOCALL, YOUTUBE STREAM. STAY APPERING SELECTED OBS CAMERA and I CANT CHANGE this . ON CONFIGURATION OPCION THE SELECTED CAMERA ITS MY WEB CAM, SO I DONT KNOW HOW CAN I FIX...