Needs domain\username & password

I'm having a permission problem to get the following script to work.Can someone fix the
script for me

eg strUsername = "domain\username"
     strPassword = "password"


strInputFile = "ComputerUsers.txt"

Dim objShell, objFSO, objInput, strComputer, strUser, objShortcut, strLine
Const ForReading = 1

Set objShell = CreateObject("WScript.Shell")
Set objFSO = CreateObject("Scripting.FileSystemObject")

Set objInput = objFSO.OpenTextFile(strInputFile, ForReading, False)
While Not objInput.AtEndOfStream
      strLine = objInput.ReadLine
      If InStr(strLine, ":") > 0 Then
            strComputer = Split(strLine, ":")(0)
            strUser = Split(strLine, ":")(1)
            If Ping(strComputer) = True Then
                  If objFSO.FolderExists("\\" & strComputer & "\C$\Documents and Settings\" & strUser & "\Desktop") = True Then
                        Set objShortcut = objShell.CreateShortcut("\\" & strComputer & "\C$\Documents and Settings\" & strUser & "\Desktop\My_Documents.lnk")
                        objShortcut.Description = "Network Source File Storage"
                        objShortcut.TargetPath = "\\tyrenet-14\transfer\" & strUser & "\my_documents"
                        objShortcut.IconLocation = "C:\Windows\System32\shell32.dll, 19"
                        objShortcut.Save
                  End If
            End If
      End If
Wend
objInput.Close

Function Ping(strComputer)
      Dim objShell, boolCode
      Set objShell = CreateObject("WScript.Shell")
      boolCode = objShell.Run("Ping -n 1 -w 300 " & strComputer, 0, True)
      If boolCode = 0 Then
            Ping = True
      Else
            Ping = False
      End If
End Function