As recommended by anyone that is doing Xamarin.Android development, I'm using Intel's Hardware Acceleration Manager (HAXM) to make my Android Emulators run faster (more here).

After this week's Windows 8 security updates I noticed that HAXM no longer worked. When trying to reinstall HAXM I'd see

The computer does not support Intel Virtualization Technology (VT-x). HAXM cannot be installed

It worked fine before - what gives?

The answer was simpler than I expected:

  1. Navigate to Control Panel > Turn Windows Features on and off
  2. Locate the Hyper-V checkbox
  3. Uncheck the root Hyper-V checkbox
  4. Click Ok

Windows will restart, run updates, etc.

Reinstall HAXM and all will work as expected.

Note - You'll read about needing to enable VT-x or Hardware Acceleration in your BIOS. Likely not the case.

I'm running Windows 8 in Bootcamp on an Intel MBP.