Before moving on with the solutions to close the VirtualBox Interface when shutting down the PC, make sure Notifications Mode in the BlueStacks is not enabled. Moreover, it will be a good idea to use only one instance of BlueStacks (if possible) and not for a prolonged time (if not in use). Also, if you do not have BlueStacks installed (happens rarely), then check if clean booting the system solves the problem.
Solution 1: Update or Reinstall the BlueStacks Emulator
BlueStacks are updated regularly to satiate the ever-evolving technological advancements and patch the reported bugs like the one causing the shutdown issue. In this case, updating the BlueStacks to the latest build may solve the problem. If you could not update the emulator at step 2, then follow the steps below: If the downloaded installer fails to update the current installation, then completely uninstall the BlueStacks emulator and then reinstall it to check if it solves the shutdown issue.
Solution 2: Kill Bluestack processes in Task Manager
BlueStacks may hinder the shutdown operation of your system if it is still operating (even in the background). In this case, completely exiting the BlueStacks emulator and using the Task Manager to forcefully close all the processes related to BlueStacks may solve the problem. And if so, then you may create a batch file to achieve the functionality. If so, then you can create a batch file and click it before shutting down the PC. Although the same functionality can be achieved by creating a shutdown task (either in the Task Scheduler or Group Policy Editor).
Solution 3: Change the Priorities of the Processes
Your system may fail to shut down if the priorities of the BlueStacks processes are not set properly. In this case, setting the priorities of the BlueStacks processes in the Task Manager may solve the problem. Warning: Proceed with extreme caution as fiddling with the processes’ priorities may make your system extremely slow or unstable (especially if the priority is set to Realtime).
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