Task Kill in Custom Action:
CMD:
/C taskkill /IM <EXE_Name> /F
VB Script:
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colProcessList = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = '<EXE_Name>'")
For Each objProcess in colProcessList
objProcess.Terminate()
Next
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colProcessList = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = '<EXE_Name>'")
For Each objProcess in colProcessList
objProcess.Terminate()
Next