Yay you solved the missing paint program dilemma. And you got a screenshot even if it isn't the best looking. When you paste the screenshot does it fill up the whole screen in paint, like does it look the exact same size as your screen? If it's smaller it might be because you are pasting it in the paints workspace (white box) that is smaller then the size of the screenshot. You can click the right bottom corner of the white box and drag it out to make a bigger workspace. Then paste. That's one possible solution. If that's not an issue you can try playing with the stretch/skew option. It's under the image tab. But that may not help the clarity too much. Also your screenshots resolution follows your desktop resolution, the higher they are the clearer they are. Mine is set to 1280x768.
You can try playing around with the things I mentioned to see if that makes it better.
You can try playing around with the things I mentioned to see if that makes it better.