اخي محب العرب افعل التالي و جرب
1. Put your Samsung Galaxy S into download mode by holding Volume Down + Home + Power.
2. Plug your phone into your PC.
3. Open up Device Manager on your PC (Control Panel -> System -> Device Manager).
4. Under "Libusb (WinUSB) devices" right click on "Samsung USB Composite Device" and chose Properties.
5. Go to the Driver tab and select Update Driver.
6. Chose to browse your computer for the driver.
7. Chose to pick from a list of devices drivers on your computer.
8. Pick the original Samsung Composite driver, press next and then follow the prompts.
9. Done