You can manage your Hyper-V server and the VMs running on it from a Vista SP1 machine. To manage multiple machines, use System Center Virtual Machine Manager (SCVMM).
Update for Windows Vista (KB949587)
Download the Update for Windows Vista (KB949587) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=D0284CEE-0E79-4453-895A-11AA8CFE6E6A)
Update for Windows Vista for x64-based Systems (KB949587)
After you have downloaded the package, you will need to modify the start menu to find them (Administrative Tools>Hyper-V Manager).
- RightClick the Start menu and then click Properties
- Click the Start Menu tab, and then click the Customize… button
- Scroll down to the bottom of the list and click your choice for System administrative tools, then click OK twice
To start the Hyper-v Manager click Start>Administrative Tools> Hyper-V Manager
For more information about SCVMM see the System Center Virtual Machine Manager TechCenter.