WindowsUpdate_80071A91" "WindowsUpdate_dt000 error

在更新win7時常不如人意，搞到最後竟出現一些錯誤代碼…這些代碼也不知道什麼意思，連上不太硬的網站照著說明搞也弄不出個所以然，讓人非常的洩氣…今天又碰到這個80071A91什麼鬼的，真的快把我給氣死，正要放棄前找到以下這帖，真好原來這才是正解，我想這應該也是微軟網站上提供的方法，只是超難找的，感謝那位post文的朋友

Answers::
Follow the instructions in the below which might help you in resolving the issue.

1. Click Start, type cmd in the Start Search box, and then right-click cmd in the Programs list.
2. Click Run as administrator, and then click Continue.
3. If you are prompted for an administrator password or for confirmation, type the password, or click Allow. At a command prompt, type the following command, and then press ENTER:
   fsutil resource setautoreset true c:\
   +Note These steps assume that Windows is installed in the default location, on drive C. If this is not the case, adjust the drive letter of the folder path to match your configuration.
4. Restart the computer.

Check if the issue is resolved.
就是用管理員身份進行 cmd 命令，再輸入 fsutil resource setautoreset true c:\ （裝在D碟的寫D:\)，重新開機，就成功了！