Multi Screen Dump is an independent and directly runnable application (it needs no installation) that works to obtain screenshots. Just run the file called MultiScreenDump.exe and the initial screen will appear captured on your screen.
Multi Screen Dump works in the following way:
Use the PrintScreen button to capture the full screen. Use the ALT key + PrintScreen to only capture the active window. The F2 key activates the mouse capture area. The F1 key opens the Multi Screen Dump configuration menu, and finally the ESC (Escape) key lets you exit the program.