Using If Then Else statement with vbs message box

I am attempting to use VBS to determine what answer a user clicks when a dialog box opens. I want to set it up so that when the user clicks "yes", the VBS executes a batch file using an If Then Else Statement. Here is the code I have so far. The message box opens but the .bat does not.

set shell=createobject("wscript.shell")
x=msgbox("Do you wish for windows Shutdown?" ,4+16, "Confirm")
If returnvalue=6 Then
    shell.run "||||File Adress||||test.bat"
End If

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