If you are rooting your Android phone or tablet pc then first you need to Install the USB drivers.
but if you have chinese phone or tablet pc like QMobile a branded chinese phone in pakistan you are in a big trouble as most of the driver's are not officialy provided by the device manufacturer but dont worry PDAnet is here to solve your problem.Just follow the step's below to install the driver.
- Go to setting on your phone >USB debugging > Developer options.
- Download PDAnet from Here and Extract it in a folder
- Go to the extracted folder and run the "PdaNetA4126.exe" file
- Select your phone/tablet manufacturer 0r Select "Others" for Chinese phones and tablets
- Click "Install" in Windows Security dialog
- Connect your phone when you see the dialog below
- Certainly now this dialog box will appear.Click Finish on the dialog.