Thanks, it worked. The problem is that the live session doesn't "remember" the mouse after reboot. Also, I am stuck at the first step of the installation process (creation of the DH0 partition), and I can't reboot to continue, instead the computer shut down completely. I see the partition created on the workbench, but the installation doesn't go any further. Then I realized that the CMOS battery is dead, that could explain a lot of things. Of course, replacing the battaey is a painful process, it is underside the mainboard and I have to disassemble the machine completely , a not so easy task, but it has to be done.
Thanks again for the tip.