Now I cannot restart it: the restart checks my memory, then says (all in German, so I won't reproduce the exact messahe here) that my configuration is bad. I can boot normally, in the last functioning version, or in safe mode - but all leads to the same bad result: the XP boot image appears, afterwards the screen goes blank and only the mouse pointer is visible, and can actually be moved. But nothing else works, and I have to shut down using the reset button.
Does anyone know what's the problem and how I can fix it? Thank you very much in advance,