>>>How can I close an existing window that was open during startup using vbscript
>>>
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>>Depending on the application that opened the Window, using the Wscript.Shell's AppActivate and SendKeys, mechanism, or manipulation via the Shell.Application's Windows collection may both work.
>
>The window is a command prompt window (it's a batch file that is placed in the startup folder).
>

Add an Exit statement to the end of the batch file