Go to the PECmd download page, get the archive with the tool - at the time of writing, the most recent version is 0.9.0.0 - and unpack it. Also, you will need a prefetch file to work with, or a folder with such a file. As you already know, it can be exported from a forensic image with a tool of your choice. As soon as you get it, open the Windows Command Prompt, and you are ready to go!