Call something like this when you're sure the process is completed.

Code:
If Not @LogonMode
  Break On
Else
  Break Off
EndIf
Dim $SO
$SO=SetOption('Explicit','On')
$SO=SetOption('NoVarsInStrings','On')
$SO=SetOption('NoMacrosInStrings','On')
$SO=SetOption('WrapAtEOL','On')

EndProc('IEXPLORE.EXE')

Function EndProc($Proc)
  DIM $Process
  For Each $Process In GetObject("winmgmts:/root/cimv2").ExecQuery("Select * from Win32_Process where Name= " +'"'+$Proc+'"')
    $Process=$Process.Terminate
  Next
  Exit @ERROR
EndFunction