Microsoft has released an update for Windows Vista to enable remote management of a Windows Server 2008 computer running the Hyper-V RC1 role

Install this update to enable remote management of a Windows Server 2008 computer running the Hyper-V RC1 role. All users of the Hyper-V role are encouraged to apply this upgrade. After you install this item, you may have to restart your computer. This update is provided to you and licensed under the Windows Vista License Terms.

Download for 32-bit
Download for 64-bit