This tutorial shows how you can set up a Xubuntu 12.04 desktop that is a full-fledged replacement for a Windows desktop, i.e. that has all the software that people need to do the things they do on their Windows desktops. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge.
The software I propose as default is the one I found easiest to use and best in their functionality – this won’t necessarily be true for your needs, thus you are welcome to try out the applications listed as alternatives.