This is a perfect time to try Linux-- Installing Ubuntu (a flavor of Linux) is even easier than installing Windows.
You simply download the CD images from the website below, then you burn them onto your own CD's. Then you pop the first one into the CD-ROM of your computer and just answer the questions.
Ubuntu Linux is ready for prime time... it is as good as Windows (and familiar to most Windows users) and best of all, it has a plethora of free software that you can install with the click of a button.
The only downside I have found are games (which some people get to work anyway) and iTunes (which Apple seems to not want on Linux).
But the ease of use, the available software, and the price (free) make this a very good choice.
http://www.ubuntu.com/getubuntu/download