http://www.esanu.name/programs/NSISKillProcess.html

Plug-in help to terminate, close, quit and detect working any process from NSIS installer.

Notes for usage:

1. Download NSIS Installer
2. NSIS Installer
3. Download Kill Process for NSIS
4. Unrar it and to NSIS instaled path, ussualy are C:\Program Files\NSIS\Plugins\
5. Make any script install.
6. Exported Function are: ExistsProcess, KillProcess, CloseProcess, QuitProcess
7. Use inside script:

Function CloseParentWithUserApproval
    Push $5
    loop:
        push "msimn.exe"
        processwork::existsprocess
        pop $5
        IntCmp $5 0 done
        MessageBox MB_RETRYCANCEL|MB_ICONSTOP
            'Outlook Express must be closed during             this installation.$\r$\n             Close Outlook Express now,             or press "Retry" to automatically close             Outlook Express and continue or press             "Cancel" to cancel the             installation entirely.'  IDCANCEL BailOut
        push "msimn.exe"
        processwork::KillProcess
        Sleep 2000
    Goto loop
BailOut:
Abort
done:
Pop $5
FunctionEnd

If want more features or any bug, fill free to contact me.

Download Kill Process for NSIS

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