You can download it from a variety of sites. I like to use DistroWatch or Linux ISO.
A couple of good General Purpose distributions are Fedora (which I use), Suse, and Ubuntu.
If you are nervous about switching over, you can use a distribution like Knoppix, which doesn't install anything (or even touch) anything on your hard drive. It's called a "Live CD" and it boots directly from the CD you burn it to. It will run an entire Linux distro from the CD to give you a taste of Linux without altering your system in any way.
Thanks, will have to check into this.
Bill Gates REALLY should do better with Windows OS, with all that money he has.....