Password under Xubuntu

I try to install Xubuntu on a laptop that got in my local trash. It is an old Celeron 650 with 5GB SD and Windows ME, that I would like to transfer (low-Windows). So I try, as I said, install Xubuntu, but I hangs on the menu where it asks the password. If I put nothing, it hangs, if I met one at random (I thought it was the creation of pesos), I said it was wrong, and I blocked.

Can someone help me ?

Tries via the bios, remove all passwords on the computer (Security> Clear Passwords me all it seems

Go into the BIOS and tells the machine to boot from the CD (Section "boot sequence" parameter "1st CD-ROM" or something like that.)