before connecting ur fone in USBnet or modem follow this :
Driver Installation Guide
by adriangatillo
Step 1. Get the software
Go to
http://www.modmymoto.com/forums/down...=2457&act=down
Step 2. Install the driver program
Extract the file “Motorola_EU_Driver_Installation.msi” from the zip file you downloaded.
Double click on this file and the installation will start.
Click next and the EULA will appear
just click on I agree --- i never read eula´s... but u have to!
leave the program to do it´s job
maybe you´ll see some of this boxes:
click... "continue anyway"
Step 3: Install the drivers
You will now have a new program group in your start>programs menu - "Motorola Driver Installer", with a shortcut called "Motorola Driver Installer.exe" within it.
Make sure the phone is disconnected at this time.
Run this program, and it will whether the drivers are already installed, when this is complete you will see the following screen
Under "Operation Mode" (lower left), select "Clean and Reinstall" (the bottom option).
Then hit "Start"
The program will then do its thing. When it is finished hit "Exit"
You may get the message about Windows Logo testing again - if you do hit "Continue Anyway"
Step 4: Connect the phone
Make sure the phone is turned on then connect the USB cable. It is best to use a USB port on the rear of the PC rather than front mounted ports as these sometimes connect to the motherboard via a hub
When you plug the phone in Windows will find new hardware - Motorola Phone, then Motorola USB Modem. The installation should complete without intervention.
done !

happy modding
INFO:
The Motorola Driver Installer was developed to easy the installation of the Device drivers on Microsoft Windows PCs. Currently the INFs and drivers are installed by the Motorola tools independently and there are issues with tools requiring updates to include the new INFs and drivers. This sometimes is not acceptable as an incorrect driver or INF version would be installed on the PC confusing the end user. This installer is design to pre install the INFs and drivers on the target machine to easy the installation of devices connect over USB. The installer is also design to clean the machine of all Motorola USB devices that were connected and installed on the system. This is accomplished by searching the registry and removing the device instances as well as parsing through the INF directory looking for any INFs that have the Motorola MDB USB Vendor ID in the INFs. If this is found in the directory the INF and the PNF file that was created is deleted.
The installer will, if select, log all information to a file and to the screen. Finally, to manage the driver versions properly the installer will parse through the drivers directory and update any drivers that are old. During a cleaning operation unneeded drivers will be deleted from the system.