Problema connessione Samsung s2 i9100 a windows 7 64 bit

Salve,

ho un problema a collegare il mio Samsung Galaxy S2 GTI9100 con Android 4.1.2 a windows 7 64 bit. Ho scaricato gli ultimi driver e l'ultimo kies dal sito samsung, ma windows continua a non riconoscere il dispositivo. Quindi ho provato a cambiare cavo USB senza ottenere risultati. Se connetto il dispositivo a linux funziona perfettamente. Lo stesso se connetto un telefono diverso come il motorola moto G. Ho provato sia con la modalità USB debug attivata sia con la modalità disattivata.

In rete ho trovato la seguente procedura, ma continua a non funzionare...

codice:

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Dear All
Following are my observations and possible steps to
1. When the phone is upgraded to Android 2.3.4 and above (mine is 2.3.6) Kies stops recognizing the phones and USB connection / Serial port connections etc get reset on the phone
2. Even if proper drivers are there on the laptop (mine is Windows 7 64bit) they are not recognized
3. Device Manager shows "unknown device"
4. Updating the driver also does not result in any help
5. solution lies in the phone
a. key in the dialer *#7284#
b. it has 4 option there..
UART (MODEM/PDA)
USB (MODEM/PDA)
c. For USB. select the PDA.if it already selected to PDA. reselect it by select MODEM and then PDA again.. Only change the USB setting.. andthen press back. try reconnect (thanks to napi1 @ androidforums.com/samsung-galaxy-s2-international/447145-sgs2-kies-not-syncing-os-2-3-5-a.html#post3484588)
6. The Laptop will start recognizing the required drivers and install them
also
Phone is not recognized by laptop when it is in USB debug mode, MyPhoneExplorer does not recognize when it is not in Debug mode

Hope this helps

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Cosa posso fare?
Grazie