Andy Fun,
You've joined a two-year-old thread! If you have some fairly new hardware Mandrake 10 may have some trouble with identifying it on boot. The current open-free version is Mandriva 2006. It may handle current hardware much better and the Mandrake Control Center's Networking section may be better able to help with your ADSL problem.

http://wwwnew.mandriva.com/

Good Luck!