SendKeys无法在Windows 7中运行

Question

我在Windows 7旗舰版中使用此代码并且无法允许我登录网站。有没有人看到它有什么问题？

    set WshShell = WScript.CreateObject("WScript.Shell")
    call WshShell.Run("http://www.gmail.com", 1, false)

    WScript.Sleep 2000
    WshShell.SendKeys "username"
    WScript.Sleep 1000
    WshShell.SendKeys "{TAB}"
    WScript.Sleep 1000
    WshShell.SendKeys "password"
    WshShell.SendKeys "{TAB}"
    WScript.Sleep 1000
    WshShell.SendKeys "{ENTER}"
    WScript.Quit()