How to kill the processer from Task Manager in QTP

How to kill the processer from Task Manager

Option Explicit
Dim objWMIService, objProcess, colProcess
Dim strComputer, strProcessKill 
strComputer = "."
strProcessKill = "'excel.exe'" 

Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" _ 
& strComputer & "\root\cimv2") 

Set colProcess = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = " & strProcessKill )
For Each objProcess in colProcess
objProcess.Terminate()
Next 
WSCript.Echo "Just killed process " & strProcessKill _
& " on " & strComputer
WScript.Quit