If i click on the camera app, it says that app is being used by another app, please close the open app and retry.

It said this the first time we clicked on it. How can I find out what is open and close it? I can't find it the "old" way, I don't under stand windows 8.1 it is nothing like the other ones from 95 on.
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2 Answers

Did you try Ctrl+Alt+Del  then process tab and scroll down!!!
There is a plethora of free tools for this. Simply search for "free process viewer" or process monitor, or any of a number of variants on that search. Thjis is a good start:

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