Hi oboedad55 ,
you can try this:
In the boot menu hit the TAB-key and add the cheatcode "nox" to the end of the line. Now hit <Enter> and when you see the text login: login as root (pw:root) and type in:
mcedit /etc/X11/xorg.conf
Go to Section "Input-Class" and replace the Line
Driver "evdev"
with
Driver "mouse"
Save and Exit (Hit F10) and type in:
Does it solve your problem?