Nothing-everything's the same
Here's what I did:
I read the "how to ..." in chef signature and deleted the registry - lower and upper filters as it says.
uninstalled the drivers - primary IDE, secondary IDE /my HDD is SATA, so it's not conected to one of them/, Intel 82801DB ULTRA ATA Controler and OHCI Compilant IEEE 1394 Host Controler.
Then I uninstalled Nero /I didn't have any other CD-R soft installed/, deleted the folder Nero in c:\program files, and then I restarted the PC.
everything was detected and installed again by Win XP automatically. The problem remains....