I have been using iolo Technologies' System Mechanic for going on two years and I couldn't be happier. It is an amazing program that speeds up and cleans out my system so that it is smooth running. My main system is not an old piece of crap either, but it still works wonders. As for my other system, which is an old and slow piece of crap, it does speed it up. Actually, as I write this, I am running it on my older system to have it jump when I wish. If anyone would like to try it, go for it as it is worth every penny. As cheap as I am, I bought it because of its worth to my machine and to my time.
Why don't you try it and tell me what you think. I would bet my butt you will love it. Check it out here: System Mechanic by iolo Technologies
Lest I forget, if you have an external hard drive or several like I do, it will defrag and align the files just as it does on your internal hard drive. External hard drives really get fragmented if you are using it as a backup. This makes it so that it is not so messy and all things are they way they should be. All I can say is this is the best product I have used on my PC and I have used many.
Try it...you'll like it!
Whoops, if you have multiple computers, the product can be used on all of them.