To try Linux, I recommend trying the Ubuntu LiveCD.

Linux LiveCDs allow you to try a fully functional Linux desktop. All you have to do boot from the CD drive. No software will be installed or modified on your hard drive as part of this. You can download a LiveCD with broadband internet. You can alsoget a LiveCD of the Ubuntu distribution mailed to you for free if you just ask for one. Finally, it's quite likely someone local has one they
would be willing to loan or give away. contact us to find out.

There is also open source software that runs directly on Windows and Open source software that runs directly on Macintosh

You may also be interested in our page on minimum recommended hardware
for a Linux desktop.

If you have questions along the way, contact someone local for assistance.