How to Fix "Internet Explorer not playing audio or video files"
The reason for the error is because your defaults have changed to a third party program for playing your audio and video files. 1.
Click Start, select Default Programs 2.
Click Set program access and computer defaults 3.
, and select Windows Media Player 4.
Click Set your default programs 6.
Select Windows Media Player
from the list 7.
Click Set this program as default 8.
. Note: Also configure third-party player so that it does not takeover the media file associations again