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#41
Sounds like it may be. Unlocker has almost always worked for me but you said you tried it.
You could also try booting a Win 10 install flash drive or DVD then press Shift+F10 at the first window. That will open a Command Prompt but you won't be booted from the installed system.
Then you could use commands from the Command Prompt window to try to get rid of it.
What is the complete path of the folder? We can provide you with the command to use from the COmmand Prompt windo, that may work.