Thanks for letting us know how you were successful on the exam! This will be of great help to others who are wondering how to do the same thing you did!
Brian,
You could try Microsoft Hyper-V Server 2012 R2. It's completely free and supports the following:
64 virtual processors per virtual machine
1 TB per virtual machine
64 TB per virtual hard disk
320 logical processors on the computer that runs Hyper-V
4 TB on the computer that runs Hyper-V
1024 virtual machines per host server
You can get more info at http://technet.microsoft.com/en-us/library/hh833682.aspx
And you can download it from http://www.microsoft.com/en-us/evalcenter/evaluate-hyper-v-server-2012-r2
Note: It does not include the full Windows GUI as such but you can manage it remotely via Server Manager.
Thanks
Tim