使用安装和部署以及Installer类卸载用c#编写的应用程序

protected override void OnAfterUninstall(IDictionary savedState)
{
    base.OnAfterUninstall(savedState);
    string directory = "C:Program Files (x86)MyService";
    if (System.IO.Directory.Exists(directory))
    {
        string[] files = System.IO.Directory.GetFiles(directory);
        foreach (string file in files)
        {
            System.IO.File.Delete(file);
        }
        System.IO.Directory.Delete(directory);
    }
}

protected override void OnBeforeUninstall(IDictionary savedState)
{
    base.OnBeforeUninstall(savedState);
    string path = "-u "C:Program Files (x86)MyServiceAA_service.exe"";
    ProcessStartInfo startInfo = new ProcessStartInfo();
    startInfo.CreateNoWindow = false;
    startInfo.UseShellExecute = false;
    startInfo.FileName = "C:Program Files (x86)MyServiceInstallUtil.exe";
    startInfo.WindowStyle = ProcessWindowStyle.Hidden;
    startInfo.Arguments = path;


    Process.Start(startInfo);

}

它不会取消注册服务,也不会删除应用程序文件夹.谁能告诉我我做错了什么？

//编辑

现在它正在尝试删除文件,但我在卸载时遇到访问被拒绝错误.我想删除的文件是.exe,.dll和其他一些文件