Did you know you can try Linux safely on any computer without uninstalling or modifying your current OS, and in fact without installing anything at all? You can boot Linux directly from a CD, called a LiveCD; it will run without touching your hard drive at all. Linux will create an imaginary "drive" in your RAM and run from there. The downside is that when you reboot, you lose everything you did while in Linux; so this is really only useful to try out Linux temporarily, and if you want to use it for real you should install it to your hard drive.
These CDs are free for everyone. You can download and burn a copy yourself. Here are some places you can get a liveCD:
http://www.ubuntu.com/
http://www.knopper.net/knoppix/index-en.html
Did you know Linux :
1. Is not evil.
2. Looks better than Windows.
3. Can do most things Windows can do as well as Windows can.
4. Can do a great many things that Windows cannot do.
5. Is free.
6. Comes by default with more software than you probably ever knew existed.
7. Can recognize most hardware nowadays.
8. Can happily co-exist beside other operating systems.
9. Is not subject to spyware and the vast majority of viruses.
10. Does not require much use of the command line if you don't want to use it.
11. Offers a lot more flexibility and customization than other operating systems.
12. Is extremely easy to install (easier than Windows in many cases).
13. Will teach you a lot about computers and how they work. Or not, if you don't care.
14. Is not evil.
I heartily endorse this product or service. If you use Linux, spread some love here. If you don't use it, why not?