Windows 8.1 – VMware Player and Hyper-V are not compatible

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I have the Hyper-V role enabled on Windows 8.1 for VS Express Windows Phone Emulation. The problem is this error when I try to run a VMWare Player virtual machine:

VMware Player and Hyper-V are not compatible. Remove the Hyper-V role from the system before running VMware Player.

The workaround is to disable Hyper-V so that you can use VMWare.

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

Source: http://superuser.com/questions/519991/vmware-player-is-not-working-after-installing-hyper-v-on-windows-8-pro