We've reviewed innumerable screen-capture utilities, ranging from tiny bare-bones programs to those that are practically image editing suites unto themselves. Plixia definitely falls closer to the bare-bones end of the spectrum, offering the very basics in screen-capture features and not much else. There are plenty of other programs that can do much more, but if you only need the basics, Plixia is worth looking at.
When Plixia is running it appears as an icon in the system tray. Double-click on it and your screen will go slightly gray, letting you know that Plixia is active. Then simply select the area you want to capture with your cursor and release; Plixia will automatically display your image in a plain interface with a few buttons that give you options for working with it. You can copy the image to the clipboard, save it, print it, or delete it. That is the entirety of what Plixia does; there are no other features and no Help file. Although we are partial to screen-capture tools that can grab the active window, full screen, or a selected part of the screen automatically, if you don't like fooling around with a bunch of features, Plixia is the program for you. What it lacks in ability it makes up for in simplicity.
Plixia comes as a ZIP file. It installs and uninstalls without issues.