Windows 7 installation O/S does not include the function of USB driver for Intel skylake series / N3000 series / J3000 series / AMD AM4 series platforms.
BIOSTAR offers the tool that automates the process to create a Windows 7 installation image to include USB drivers. Please follow the instructions below.
Download Windows tool from the link below and unzip to a temporary folder on your system. http://www.biostar.com.tw/utility/windowstool.zip
Connect the USB pen drive to the your system.
Right-click the file WindowsTool.exe and select "Run as Administrator".
Choose the Windows 7 image file from ISO file or DVD ROM of "Source Path".
Choose your USB Disk Volume and press "Start" to begin the creation process.
Wait for the process to finish. It might take up to 30 minutes.
Use the USB pen drive to install OS.