Low volume when screen sharing video clips from the browser and Power Point

Hi ,

I currently have a Zoom 1 pro account. 

The problem that I am facing is when I share screen and play embedded videos from Power Point or directly from the web browser participants cannot hear as the volume comes across very low or muffled. 

I have tried increasing the volume from my Dell Laptop but still no joy. 

Can you please let me know how this can be sorted out?