Originally posted by jailbait
You should install Mandriva as a third operating system in its own partition. After Mandriva is working then erase SuSE by reformating the SuSE partition.
Ideally, this is the correct answer. However, if he has a dual boot system, there's a good chance he doesn't have another partition for Mandriva. In this case, I would do as XavierP posted. For just a dual-boot, you shouldn't need to know much about lilo - mandriva should take care of adding the Windoes OS. Just a hint from someone who HAS tried both 2005LE and 2006, 2005LE seems to be much less buggier and may be the best Mandriva has come up with thus far. As far as install, there's no difference.