Been looking around for more info on installing both Hyoer-V and VMWare (any version) side by side on my Server 2008R2 box. Found a solution for the problem that entails modifying the boot menu to be able to start without the Hypervisor Running:
bcdedit /copy {default} /d “No Hypervisor”
after pressing enter a message stating the operation was succesful,
you should also see a GUID.
Copy that and use it in the command below
bcdedit /set {GUID_RETURNED_FROM_PREV_COMMAND} hypervisorlaunchtype off