Why does defragmenting your computer’s hard drive make your system run better?
Well, when you fill a bucket with water, it fills from the bottom to the top. Your computer’s hard drive fills up in a very different way with programs and other data spread across different locations across the entire drive. Because of this, a cluttered computer can take longer to find and open files.
The way to fix this is to Defragment your hard drive.
While Windows has a built in tool to do this, you can also try a free program called defraggler that also has the ability to defragment specific files or an entire hard drive.
You can download Defraggler HERE