經過各種嘗試，查看了path,沒有問題，登錄檔不敢亂改，在這種沒有成功的情況下，發現下面這句讓我解決了問題，特此分享。

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Though this might be already solved let me tell you what I did to solve this problem. I had exactly the same problem yesterday (June 28th, 2011)

I was able to solve this problem by the procedure below.

1. Navigate to the following directory:

     C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG

2. Copy the 'machine.config' file to desktop just in case before you go to 3rd step.

3. Renamemachine.config to machine.config.old which is locating in the directory above.

That's it, nothing else is needed.

Thank you

中文：

1.進入目錄C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG

2.備份'machine.config' 這個檔案到其他地方

3.刪除該檔案'machine.config'

4.重新開啟MMC，發現可以使用了。 ---------------------  作者：hansbin  來源：CSDN  原文：https://blog.csdn.net/fhqsse220/article/details/12649673  版權宣告：本文為博主原創文章，轉載請附上博文連結！