I'm not a computer geek. I have no more interest in messing with a computer than I have in messing with a light switch when it's too dark to see. I just want them both to work.
I've been using Smart Defrag for a couple of weeks. Now, this is my kind of software: It's free, it works well, and it eliminates one small part of "messing with your computer."
Smart Defrag defragments your drive continually by working in the background during idle time. Install it and forget it--no additional input is required, and you never have to concern yourself with defragmenting a drive again.