vSphere Customization Specification Manager Bug

I've been working at a client the past few weeks and one of my tasks was to begin the process of upgrading their infrastructure to vSphere 5.  As we all know, the first step is to upgrade vCenter.  So I walked through the upgrade across all three vCenter servers and everything seemed to be ok until we went to deploy a new VM using a customization specification that had been created previously under vCenter 4.1. During the customization process for the VM we received the infamous "Windows Setup encountered an internal error while loading…

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