Monitor minimizes in middle of video stream

[1rosaf]

Hi, when I try to stream movies via hdmi cable from my computer to my tv, I can watch about 15 minutes, and then the picture minimizes, and I have to get up and maximize it again.
I get a message when the video stream starts saying in order to enjoy uninterrupted viewing, I should disable my computer screen. Do you have any idea what this is talking about and how I can do it? Thanks!!

 

[Pusspa]

have you turned off the screensaver?

 

[1rosaf]

How do you do this?

 

[Pusspa]

right click on the desktop, then choose personalize, then at the bottom of the window that opens you can select your screensaver, choose none!