Give Linux a try

If you have heard of linux and want to give it a try, I suggest using a "live cd" this is a cd on which you have burned an image and you the boot your pc from the cd. This allows you to try different distrobutions without changing anything on your pc. A good first site to obtain these images is The Live CD List

You must burn the .iso image to the cd, you can't just copy it. I recommend a program called Infrarecorder