Howtoforge posted a guide about setting up Mandriva One 2009.1 with GNOME as desktop

This tutorial shows how you can set up a Mandriva One 2009.1 desktop (with the GNOME desktop environment) 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 Perfect Desktop - Mandriva One 2009.1 With GNOME