A reboot from a previous installation is pending. Please restart the system and then rerun Setup.
For more information, visit: http://technet.microsoft.com/library(EXCHG.150)/ms.exch.setupreadiness.RebootPending.aspx
解决方法是删除位置 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager 中的注册表项 PendingFileRenameOperations,重新安装