Locate Intel Hardware Accelerated Execution Manager (HAXM) for Microsoft Windows, to update HAXM or change memory size.

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The Intel Hardware Accelerated Execution Manager (Intel® HAXM) is a hardware-assisted virtualization engine (hypervisor) that uses Intel Virtualization Technology (Intel® VT) to speed up Android app emulation on a host machine. In combination with Android x86 emulator images provided by Intel and the official Android SDK Manager, HAXM allows for faster Android emulation on Intel VT enabled systems. ~ https://software.intel.com/en-us/android/articles/intel-hardware-accelerated-execution-manager

According to the document Installation Instructions for Intel® Hardware Accelerated Execution Manager - Microsoft Windows:

- The SDK Manager will download the installer to the "extras" directory, under the main SDK directory. Even though the SDK manager says "Installed" it actually means that the Intel HAXM executable was downloaded. You will still need to run the installer from the "extras" directory to get it installed.

- Run the installer inside the <sdk folder>/sdk/extras/intel/Hardware_Accelerated_Execution_Manager/ directory and follow the installation instructions for your platform.

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Actually, you cannot find intel in C:\Program Files (x86)\Android\android-sdk\extras\ folder.

it should be in C:\Users\user\AppData\Local\Android\sdk\extras\intel\Hardware_Accelerated_Execution_Manager\intelhaxm-android.exe

To locate it, run AVD (Android Virtual Device), it will be shown in 'Run' box:

If you already have a old HASM installed, you want to update new version, or change memory size, you have to uninstall the old one firstly, in Windows Control Panel. Then run the C:\Users\user\AppData\Local\Android\sdk\extras\intel\Hardware_Accelerated_Execution_Manager\intelhaxm-android.exe again.