Hyper-V cannot be installed: A hypervisor is already running.

If you want to add a Hyper-V Role on Windows Server 2012, under VMware ESXI 5.1, you may receive the error message “Hyper-V cannot be installed: A hypervisor is already running.”

To fix this you need to do the following:

1. First, shut down the Windows 2012 Server virtual machine on ESXI 5.1
2. Download and modify the .vmx file associated with your virtual machine, from ESXI server. 
3. Add the following lines to the end of the .vmx file:

·         hypervisor.cpuid.v0 = FALSE

·         mce.enable = TRUE

·         vhv.enable = TRUE

4. Upload the new .vmx file to ESXI Server
5. Restart your virtual machine.

Use the above at your own Risk.

Windows Server 2012 Migration Guides.

By using the migration tools, administrators can migrate certain roles, features, shares, operating system settings, and other data from the source server to the destination server running Server 2012.

There is no single procedure for migrating all the Windows Server roles. Instead, Microsoft provides detailed migration guides for individual roles, and sometimes for individual role services within a role.

Up-to-date migration guides are available at the Windows Server Migration Portal at the
Windows Server 2012. Link

 

Hyper-V Virtual Switch

This tutorial will show you how to use Hyper-V Virtual Switch 101, and how to create and use Virtual Switches to connect Virtual Machines to Network.

Link

Windows 8 Hyper-V

This tutorial will show you how to use the built-in Hyper Virtualisation (Hyper-V) in Windows 8 Pro or Windows 8 Enterprise to install and run a Windows XP.

Link

Error 1935 when you try to install Microsoft Office 2010

If you see "Error 1935. An error occurred during the installation of assembly component" when you install Office 2010 or 2007 or one of the Office stand-alone products like Excel, restart the computer and try to run setup again as a quick first step.

Link