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I ran into this myself. The reason for this is if you have Hyper-V turned on then you cannot install any other virtualization technologies such as HAXM. HAXM is used to speed up the emulator when developing mobile apps for Android or Kindle. This can affect Windows 8, Windows 8.1, Windows Server 2012, Windows Server 2012 R2.

So here is what I did:

  1. Open cmd window as Administrator.
  2. Type: bcdedit /copy {current} /d “Windows 8 – No Hyper-V”
  3. Type: bcdedit /set {identifier for the new boot entry that you can copy from the output of the command above} hypervisorlaunchtype off

HAXM then installed correctly and was functional. This allows you to use Hyper-V or HAXM depending on which boot settings you chose. This is useful for people like me that need both Hyper-V (Windows Store/Phone dev) and HAXM (Android/Kindle dev).

I had found this information from: http://forums.ouya.tv/discussion/82/windows-8-how-to-install-intel-haxm-after-installing-hyper-v