Maybe device manager has wrong driver or ground both of the pins?
no idea, i will try install windows xp and vista, i have a desktop with windows 7 home premium 64-bits and won´t work too... the chip and all is perfect, i think you are right and is all about drivers or something like that...
And read this: I have included on your picture what needs to be done in order to enter DFU mode. The pins DFU and RESET must be connected to ground , and that will reset the mcu , and check the state of the dfu pin , if its grounded , it enters DFU. You can just short them all together , but its not a "safe" idea , you might damage your chip if you do it, if you use the logic i put , the 2 diodes prevent the DFU and RESET pins to be connected directly together.
Last edited by javi2828; 10-08-2010 at 04:20 PMReason: Automerged Doublepost