Free Math Board Game is a puzzle game with a 6 x 6 matrix where the digits 1 through 6 must be placed in each column and in each row without repetition.
Windows gets overloaded. It just goes slower and slower until most people throw their PC away! Better to do a live clone of Windows (from itself) with a drag and drop using 10PCs-in-1 and then uninstall all the clutter from the clone and start again!
Get the spirit of the West; get Monument Valley Widescreen Screensaver. Comes with a stirring western soundtrack (which you can mute), pictures which you can export as wallpaper, and a sticky note feature for putting digital post-its on your screen.