If you need to quickly capture something on your screen then snip it! The Windows snipping tool allows you to create a screen shot, or capture a snip, quickly and easily.
Snip it can be found by searching your Windows for ‘Snipping tool’.
Watch this 40 second video for a quick introduction:
No audio on this one, just captions, so safe to watch in a busy office.
For more information, take a look at this page by Microsoft.