The Snipping Tool can be found on your Windows PC in the Accessories folder (beginning with Windows 7). This is a simple tool that allows you to create screen shots the easy way, without having to hit the PrtScn button and pasting into a separate program (although there are still times where this tip will be useful). With the Snipping Tool you simply draw a box around the portion of the screen you want to save and the program automatically allows you to save the selected portion as an image.
When you have decided on the screen view you want to save, open the Snipping Tool, select new and use the cursor to select the area you want.
The selected area then opens in the Snipping Tool window.
You now have the option to the save the file, email it, make notes on it or even highlight certain parts. Easy, and it cuts out several steps from the version I have been doing.
More more information check out this post on the tool at Microsoft.com.