Hyper V and VMWare on the same machine

If you get, "internal error" while starting a VM, please start "VMware Authorization Service" Service. and try again.
To do this open an Administrator Command Prompt, enter this command and then reboot:

bcdedit /set hypervisorlaunchtype off

Hyper-V can be enabled again with this command (which also requires a reboot):

bcdedit /set hypervisorlaunchtype auto

Ref : https://pricklytech.wordpress.com/2014/02/25/windows-8-1-vmware-player-and-hyper-v-are-not-compatible/