A great tool in Windows 7 (and also in Windows 10) is the Snipping Tool. This tool allows you to "snip" anything on your computer screen. You can then save the snip as a graphic, copy and paste it to another program or email it. You can also use the drawing tools in the program to emphasize a certain area of the snip.
Here's a quick two minute video to show you how it works. https://youtu.be/bL47s3R127o