Hal.dll - autocad 2006 & winxp SP2

Using Autocad 2006 with Win XP SP2 I experience the following problem: after few session I get a black window and then, after few more Autocad
session the system crashes and during the boot I am requested to provide (usually but not always) the "Hal.dll". Any suggestion to fix the problem? Thank you
Nell'utilizzo di Autocad 2006 su Win XP SP2 mi capita il seguente problema: dopo alcune sessioni Autocad appare una finestra nera di errore, poi alcune sessioni dopo il sistema va in crash e al riavvio vengo richiesto di fornire il file "hal.dll". E' successo ad altri? Come potrei risolvere il problema? Grazie
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