There may be several causes which lead to the service being stuck in “marked for deletion”. - #4 Usually solves it for me
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SysInternals' Process Explorer is opened. Closing it should lead to automatic removal of the service.
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Task Manager is opened.
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Microsoft Management Console (MMC) is opened. To ensure all instances are closed, run taskkill /F /IM mmc.exe.
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Services console is opened. This is the same as the previous point, since Services console is hosted by MMC.
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Event Viewer is opened. Again, this is the same as the third point.
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The key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\{service name} exists.
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Someone else is logged into the server and has one of the previously mentioned applications opened.
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An instance of Visual Studio used to debug the service is open.
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