How to stop computer slowing down ? Windows PCs typically slow down as applications are installed and used. Whether you are using a word processor, writing a spreadsheet, surfing the internet, playing games or anything else, hard drives fill with temporary files that do not always get removed when no longer needed. Hard disks can succumb to this wear and tear over time, and this article will teach you how to fix that. Read on to learn of ways to help keep a PC running smoothly with little or no money.