random pop up unnamed window at the left corner in windows 7

Mar 23, 2018
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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 find anything. I also formatted computer and installed again. But it happened again. I could not find the solution. I will be a lot appreciated if someone faced with that problem before and can help me then ? I also attached the pictures so you can see how it looks like.

for the screenshot --> https://ibb.co/iJuX5S
 
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