Ooops, there is a rescue.... When presented with the lilo screen, press control + x , and then type linux 3 and then enter I believe, to boot to command prompt only. Then edit the /etc/inittab file, and then try Xconfigurator and mouseconfig. You could also do "linux single" if you have forgotten the root password, as this boots you in with root rights without asking for a password. But you might as well reinstall just for the practice and the familiarity. There are probably other options you chose you might want to revise.