Have you ever tried using a five-year-old computer to get something done? It's frustratingly slow, right? That's because, over time, the operating system decays. During the normal lifespan of a computer, you can expect to install and uninstall dozens of programs, hundreds of Windows updates, and who knows how many registry edits. After all of this is done, your computer is significantly different from when it was fresh out of the box. This process has been called many things: software rot, code rot, bit rot, software erosion, software decay, software entropy, etc.