For installing MS Hyper-v, complete a full install rather than core(or free iso) installation.


Backup system(snapshot) works more consistently and better as a Full 2012 install based on several installations now.  i.e. install Windows Server 2012 then install Hyper-v as a role.


For core/free installations of Hyper-v you can use The free gui console utility to improve the experience:

https://blogs.technet.microsoft.com/keithmayer/2013/03/20/managing-free-hyper-v-server-2012-with-a-local-gui-console-tool/