Can't create new partition on SSD

I cannot create a new partition on a healthy SSD. In Disk Management, when trying to shrink the existing, healthy partition to create unallocated space for the new partition, I receive the Virtual Disk Manager error message, "The service cannot be started, either because it is disabled, or because it has no enabled devices associated with it." The SSD is a Samsung 840 512GB installed to three partitions with Samsung's supplied cloning software under Windows 8 on a new Lenovo T530. The partition I want to shrink is 475GB with plenty of unused space. In setting up the SSD with Samsung's SSD Magician, the system changes I made were only to disable defrag but not "superfetch" (if that's relevant).