My PC needs Tune Ups

I have a disk defragmenter in my computer but haven't been using it lately. Soon, I need to run it to re-aligns hard drive files and recharge my computer speed and performance. I have been using my computer for almost two years now and noticed its overall speed and responsiveness have slowed and the files and programs take longer to open. I think it is about time to defragment my PC. This weekend is a good time to do it.