Consider the following scenario:
Using Windows Server 2012 Hyper-V Manager, you create a Virtual Machine with a VHDx hard disk using the New Virtual Machine wizard.
You install Windows Server 2008 R2 as guest OS on the newly created Virtual Machine. Following the install, EventID 412 and EventID 257 are logged in the Application Event Log of the guest OS.
Using Windows Server 2012 Hyper-V Manager, you create a Virtual Machine with a VHDx hard disk using the New Virtual Machine wizard.
You install Windows Server 2008 R2 as guest OS on the newly created Virtual Machine. Following the install, EventID 412 and EventID 257 are logged in the Application Event Log of the guest OS.