Creating a VM with System Center 2012 R2

Someone else installed Virtual machine manager and is no longer with us.  When I try to create a new VM via the wizard, the OS will not install.  I create the new VM with a blank virtual HD, name it, check Hyper-V under compatibility, select existing ISO image under Virtual DVD drive, configure the HD and memory, check connected to a VM network under the adapter.   When I launch it after it is created, it acts as if the OS is starting to install but if never does.