Microsoft Test Manager cannot access the machines. Possible causes: - The user account provided is not a member of the Administrators ...

Microsoft Test Manager cannot access the machines.  Possible causes:
  - The user account provided is not a member of the Administrators group on the machines. Click the Machines tab and enter a different user account and password.
  - If the machines are running Windows 8, Windows 7 or Windows Vista and non-domain credentials are provided, then Remote User Access Control is not disabled on them.
  - If this machine is local, then run Microsoft Test Manager as an administrator.