Just follow these steps:
Go to Control Panel β Program and Function.
Turn Turn Window features on and off. A window will open.
Uncheck Hyper-V and reboot the system.
Now you can start the HAXM installation without any errors.
Hyper-V is only on Windows8.
So follow these steps
First of all, make sure you enable virtualization technology in your BIOS. After the computer restarts, press F1-F12 on the keyboard and find this option.
Make sure you disable Hyper-V in Windows 7 / Windows 8. You can disable it in Control Panel β Programs β Windows Features
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