If you get the 'aws' is not recognized as an internal or external command error message in Windows Command Prompt (cmd) even after installing the AWS Command Line Interface (CLI) 64-bit using the Windows Installer, then please Log off and Login to your Windows computer again. This simple trick will help solve the problem.
After login to your Windows computer again, open cmd (Windows Command Prompt) and this time, type the aws --version command should return the output successfully without any error.