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#1
Go to Settings -> Ease of Access -> Keyboard and check you don't have anything set there.
Then under Settings -> System -> Default Apps, use the reset to default button.
However other than that, we would need to know what Key combination is producing the message concerning default app opening.
I reset default apps, and i checked ease of access center but its seems all fine to me, i didnt solve the problem, but thank you for help.
i google it and people says that is problem with virus