Hi. I have a little bit older Gateway PC running windows XP Pro. A friend of mine just gave me a Dell tower (without a hard drive). It's used but it's better than the one I've got. My question is can I simply remove my hard drive from the gateway and swap it into the dell without having to back up and reformat? Or, I also have another hard drive that I could put into the Dell and do a fresh install on. In that case could I put in the hard drive from the gateway into the Dell as a slave without having to backup and reinstall. And can you also tell me the steps to adding a second hard drive please.