If your computer is getting slow, one of the reasons could be that your hard drive is getting full. Things that take up the most space can be photos, videos, music or software programs.
Getting rid of Software that you're not using is an easy way to free up a chunk of hard drive space if you know your hard drive is getting full. It's also great if you're sick of your desktop screen and start menu being cluttered with icons for programs that you never use.