After you install SP1 on Windows 2008 R2 SP1, you may encounter problems with RDP after reboot. This happens if http://support.microsoft.com/kb/2667402 is already installed.
Fix: Uninstall http://support.microsoft.com/kb/2667402 before installing SP1J
If you already have installed SP1 with KB2667402 already installed you must uninstall KB2667402 and then re-apply it. You can uninstall it remotely with following command:
wmic /node:<SERVER> process call create “powershell wusa /uninstall /kb:2667402 /quiet /forcerestart”
在更新Windows 2008 R2 SP1 后你可能在重启后发现RDP不能正常使用了（登录不进去） -- 出现这种情况的原因可能是因为 kb2667402 已经被安装了 (http://support.microsoft.com/kb/2667402)
把这个更新包卸载了那么就会再次成功登录RDP；可是如果是远程服务器本人不能直接进行本机操作那怎么办呢？
别急，用下面这个远程访问的命令就可以实现了：
wmic /node:<SERVER> process call create “powershell wusa /uninstall /kb:2667402 /quiet /forcerestart”
原文给的命令里面没有给用户名密码参数，99.999999%的服务器都是需要用户名密码进行登录的，所以大家可以尝试下面的命令符
wmic /node:<服务器地址> /USER:<用户名> /PASSWORD:<密码> process call create "powershell wusa /uninstall /kb:2667402 /quiet /forcerestart"