A: Hyper-V's Integration Services are a necessary installation into most Hyper-V virtual machines (VM). Installing Integration Services adds necessary drivers and services that let the VM perform its best on a Hyper-V host.
Windows Server 2008 R2 SP1 includes important updates to these drivers and services, requiring them to be updated after SP1 is installed to a Hyper-V host.
Perform this update by clicking Action, Insert Integration Services Setup Disk, then Install Hyper-V Integration Services in each VM's Virtual Machine Connection. This process can be automated using System Center Virtual Machine Manager.