random pop up window

My cmd always been popping up like around every 10-30mins. It also pops up in start up. I can't play games because the game minimizes when the cmd pops up. Heres what it looks like: https://drive.google.com/file/d/1ZoxO4nJ3yfE4wdbs46mPnNoBPzXmOE5z/view?usp=sharing

I have a problem for 6 months and I do not have any idea what caused it to start. one small window is appearing randomly in the left corner and stays there around 4-5 seconds and disappearing again. During this time, computer is stucking or slowing down a lot. I am using Avira and it did not...