Since my first forays into Xamarin I have been making great use of this awesome trick by Scott Hanselman to quickly change from a configuration with Hyper-V (for Windows Phone and Windows 10 Mobile development) and Virtual Box (for using emulators based upon VirtualBox. I created this dual-boot option in Windows 8.1, and it survived the upgrade to Windows 10 RTM 10240 in July.
After updating to the Windows 10 Fall update (aka 1511, aka 10586.3) I found out I had two boot option in my boot screen - "Windows 10" and "Windows 10", both with Hyper-V enabled.
Bummer.
Fortunately, this is easy to fix.
- Open an admin command prompt
- Enter bcdedit.
You will get a list of three entries, the first one "Windows Boot Manager" (ignore that) and two called "Windows Boot Loader" - Check that both have an entry "hypervisorlaunchtype" set to "Auto"
- Both boot loaders description "Windows10" and will have an identifier. One will be a {current}, the other a GUID like identifier, like {3bca20f3-367f-11e5-9da7-f5ee60b7b905}. That is the one you can change.
- Enter bcdedit /set {your-guid-here} description "No Hyper-V"
- Enter bcdedit /set {your-guid-here} hypervisorlaunchtype off
If your reboot now, you will once again have two options, one with description Hyper-V, the other still called Windows 10
Caveat emptor: playing around with the boot editor can seriously mess up your system. Be sure of what you are doing. Even I usually stay away from this as much as possible. Worked on my machine - I cannot accept any responsibility for it not working on yours :)
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