You can produce a file that contains an image of anything on the screen.  Here's how to do it:

1. Press the "Print Scrn" key.  This copies the contents of the screen to the Windows clipboard.
2. Open the Paint program (or any other image editing program).
3. Choose "Edit | Paste" from the main menu.
4. Choose "File | Save As..." from the main menu.
5. Choose a folder in which to save the file using the "Save in" dropdown box at the top of the "Save As"dialog box.
6. Choose "JPEG" from the "Save as type" dropdown box at the bottom of the "Save As" dialog box.
7. Type a name for the file in the "File name" box and hit the "Save" button.