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The error that another emulator is running is probably correct. Your emulator is probably locked up at a level where it doesn't show up in that pane of the task manager. The Apps field only shows processes with windows. If you look in the details pane it will likely show an instance of something like qemu-system-x86_64.exe (exact process will depend on which emulator you are using and what type of system you're running on). It may also be listed under Background processes.