Random black window

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Joined
14 Dec 2017
Posts
2,040
Location
Aberdeenshire
I have this small window that is hardly noticeable on my desktop but I can resize it and move it around but I cannot close it, does anyone know what it is and how to get rid of it. Thought it was a stuck pixel to start with till I clicked on it.
I've also asked in another section but if this is the wrong bit could someone kindly move it.
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No cross to close it off, I've tried to disable all startup apps and I've un installed recently installed software
 
When I click task View on the task bar it's called MainWindow and I can close it but it reappears when I startup again
 
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