Enable and disable hyper v on windows 8.1 so that hyper v,visual studio 2013 phone sdk and vmware can be used properly ,IT Faculty Sourav Bhattacharya,Kolkata 09748184075

From an elevated command prompt:

bcdedit /set hypervisorlaunchtype off
to disable hypervisor, and:

bcdedit /set hypervisorlaunchtype auto
to reenable it (default value).

Of course it still requires restart.

Source:https://superuser.com/questions/540055/convenient-way-to-enable-disable-hyper-v-in-windows-8