A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
It's fairly easy--once you've inserted a video using the Powerpoint "INSERT VIDEO FROM" tool, all you need to is click on the inserted video (once it's in Powerpoint) and look for PLAYBACK in the toolbar. Click on it and it gives you many options for starting, including AUTOMATICALLY or CLICK or WHEN CLICK ON. Sounds like your best option, which is the default, is CLICK. Surprised it hasn't been working for you.