If you face the vt-x is disabled in the bios error while trying to run Android emulator, here is the solution that worked for me.
Step 1: Enable Virtualization Technology in BIOS
Go to BIOS Setup and enable “Virtualization Technology” option.
On my Lenovo laptop this option was already enabled, but still getting this error. I have disabled it and re-enabled it, then it is working.
Step 2: Install HAXM Installer from Android SDK Manager
Start the Android SDK Manager, select Extras -> Intel x86 Emulator Accelerator (HAXM Installer) and install it.
Step 3: Install Intel’s HAXM
Install Intel’s HAXM by running the following installer.
That’s it. Now restart the system and hopefully you should be able to run the Android Emulator.