Even if you have enabled the Virtualization(VT) in BIOS settings, some antivirus options prevent HAXM installation.
For example: In Avast antivirus under Settings (parametres) tab > Troubleshooting (depannage), you should uncheck “Enable Hardware-assisted Virtualization” (“activer l’assistance a la virtualisation”).
Now restart your computer and re-install the Intel’s HAXM which can be found under ~SDK_LOCATION\extras\intel\Hardware_Accelerated_Execution_Manager
. You can also manually download the standalone HAXM installer from Intel’s website.