When you push the print screen key and paste it on mspaint, you will get the entire screen, most of the times the windows or the background pictures that you don’t need. There is a trick that you can do to take a screenshot of only the window you need. Push and hold the ALT key and then press the print screen key. Now try to paste it on mspaint, you will notice only the active window is captured. So when ever you want to take a screenshot of a small window, for instance the screenshot of winamp, click the window that you want to take a screenshot of and then press and hold the ALT key before you press print screen.