I use PCLinuxOS click here and that is all I use. The CD will run as what is called a live CD what happens is that the computer is booted with the CD in the drive and the OS then runs from the CD which gives you a chance to make sure the OS runs with no problem before you install it. It does everything you need, plus a lot more and more securely than Windows. there are a few of us on here who run Linux so we should be able to get you going on it. Be prepared though, Linux isn't Windows even though it looks the same, so you are going to have to be patient with yourself as you learn how to use it, but it will be worth it in the end.