目录异常.转向Windows 7

我继承了一个c#应用程序，它最近被部署到Windows 7工作站。在此之前，它已经在许多Windows XP工作站上运行，没有遇到下面的问题。

这段代码试图在线程中使用循环来移动目录。在Windows 7机器上，IOException被捕获。根据MSDN (http://msdn.microsoft.com/en-us/library/system.io.directory.move.aspx) IOException可以由3种情况引起。我想知道循环是否试图多次移动目录，这可能会导致"目标已经存在"条件。

症状是反复显示警告MessageBox，但移动最终会成功。从我对代码的解释来看，这应该只发生在60秒后(300 * 200ms)，但它似乎几乎立即发生。

由于我对c#的经验非常少，而我对线程的经验更少，我在这里不知所措!我想知道这段代码是否有什么明显的错误。

相关代码段如下:

    public static string archiveBatch(Batch myBatch, string from)
    {
        string to = "";
        to = FileSystemManager.getArchivePath(myBatch, System.IO.Path.GetFileName(from));
        threadedMove tm = new threadedMove(from ,to);
        Thread t = new Thread(new ThreadStart(tm.run));
        t.Priority = ThreadPriority.Highest;
        t.Start();
        return to;
    }
    private class threadedMove
    {
        string archivePath;
        string fromPath;
        public threadedMove(string from, string to)
        {
            archivePath = to;
            fromPath = from;
        }
        public void run()
        {
            int errorCounter = 0;
            while (true)
            {
                errorCounter++;
                if (TryToMove(fromPath, archivePath)) { break; }
                Thread.Sleep(200);
                if (errorCounter > 300)
                {
                    throw (new Exception("Warning: could not archive file from "+fromPath+" to "+archivePath));
                }
            }
        }
    }
    private static bool TryToMove(string source, string destination)
    {
        try
       {
             //check if path is file or folder
            if (System.IO.File.Exists(source))
            {
                //it is a file
                if (!System.IO.File.Exists(destination))
                {
                    System.IO.File.Move(source, destination);
                }
            }
            else
            {
                //it is a directory
                if (!System.IO.Directory.Exists(destination))
                {
                    System.IO.Directory.Move(source, destination);
                }
            }
            return true;
        }
        catch (IOException)
        {
            MessageBox.Show("Warning: could not archive file from " + source + " to " + destination", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            return false;
        }
    }

catch (IOException ex)
{
    MessageBox.Show("Warning: could not archive file from " + source + " to " + destination + ". Error: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
    return false;
}