Yes, I'm on the session of the administrator of the computer. But I don't have installed libusb-win32. I don't know what it is and I do= n't have seen it installed. Maybe It's an other program which creates the same problem. I'm going to = try with an other computer. Tell me if you have other suggestions or ideas... I'm looking at my side. =20 Thanks PiR Chen Xiao Fan a =E9crit : Have you installed libusb-win32? I think libusb-win32 has this bug=20 and I am facing the same problem as you in the computers with=20 libusb-win32 installed. However I am not the administrator of the computer and I am not so sure whether this is exactly the reason. I guess that LIBUSB-WIN32 disabled the Windows notification of=20 USB device unplug/plug. When you reset the PICDEM, the PIC FS=20 USB is unplugged and then plugged. Are you the administrator of the computer? Regards, Xiaofan -----Original Message----- From: Pierre B Sent: Thursday, August 04, 2005 3:05 PM Hello, I imagine well the driver can not be signed by Microsoft.=20 But it changes nothing : it doesn't want to be installed.=20 Thus my problem must be elsewhere. Can it come from the=20 program? Because I've noted that each time I started=20 again the PC the device functioned correctly ...=20 until I resetted the PICDEM board. regards, PiR --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist =09 --------------------------------- Appel audio GRATUIT partout dans le monde avec le nouveau Yahoo! Messeng= er T=E9l=E9chargez le ici ! =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist