Hi there, thank you for your great advices. I have a persistent problem on WinXP SP2 (Italian) that shutdowns once in a while without notice (I don't even see the BSOD!). I understood that the problem is related with HW (or drivers), since I had the experience with different software running (I noticed that an application usually up is: Virtual PC 2007 portable). This is the latest event report: System Error Categoria 102 Evento ID 1003 Codice errore 100000d1, parametro1 44cb08a0, parametro2 00000002, parametro3 00000001, parametro4 f6443263. I attached both the two last minidumps and the debuglog that I made following your precious instructions. But then.... what is the culprit? I am still in the dark! Is it related with the unavailable drivers (which I should remove) or whatever? Many thanks for your help.