You have two options to be able to create Stills from the Videos. You may either use print screen option or use the snipping tool. Play the Video
you want to create still with and pause to the position where you want the still to be created.
Snipping tool:
1. Open Snipping Tool by clicking the Start button, clicking All Programs, clicking Accessories, and then clicking Snipping Tool.
2. Click the arrow next to the New button, select a snip type from the menu, and then use your mouse or tablet pen to capture a snip.
Here is an article that will give you more information about snipping tool: