The Msvm_VirtualSystemManagementService object was not found

1. Server 2008 R2 SP1, Hyper-V in AD can't connect to VM host
2. Download  KB950050：Windows Server 2008 x64 Edition 的 Hyper-V 更新
   http://www.microsoft.com/zh-tw/download/details.aspx?id=18567
3. OK!