Computer cluster? (Not FIRST related)

[toastnbacon]

First off, sorry about posting this question here, I didn't know where else to go where I could get help.

But as to the actual question: I have two computer towers running Windows XP and another tower without an OS. I also have a Dell laptop running Windows 7. What I want to do is somehow use them in tandem (as a cluster? Not sure if that's the right word...) as a regular home computer. I sometimes push my laptop too hard, and I'm looking to speed it up in any way. Is what I'm wanting to do possible, and if so, how? Thank you in advance!