When i installed VMM and added a new host i got a strange error (se Picture below). The solution for this problem was a Little strange. I had to install the file server role on my hyper-v hosts and after i did that i could install the VMM agent.
I hope this will help some people out there.
If you are installing System center configuration manager 2012 on a server using a dedicated SQL-server you might get this error.
This error can be resolved by adding the computer account on the SCCM server to the SQL-servers local administrators group.
Now the installation can continue.
If you get this problem (se picture below and se the kerberos status) This is not a hard thing to repair tho.
You can get some more information on the status from server manager. It can look something like this.
This means that the cluster was unable to create the computer object that is required in the active directory. So go to your active directory and a OU you desire and create a new computer object. Now select that the computer object should be a member of Domain Computers.