When working with virtual machines, it is very helpful to run SysPrep on the operating system that you want to clone. This way, the guest operating system receives a unique GUID and MAC address when they start up. Otherwise, you will (like me) encounter any number of conflicts when bringing a new VM online.
Megan Davis has a very helpful post that details how to sysprep a virtual machine step by step.
This is going to save me lots of time when bringing a new VM online. If you're working with base virtual machines, you also need to be doing this. Thanks, Megan!