We are in the process of using the Win7 system, sometimes we plug in the USB device, sometimes the system can not read, and then will be prompted to say "do not recognize the USB device", that is the set of problems or what? Let's take a look at the processing of USB devices that are not recognized by the Win7 system.
Step one: Generally in the ghost Win7 inside the "Unrecognized USB device" situation, because the user put the USB device into the computer chassis front of the USB device interface, and cause such a failure is not due to the Win7 system setup problem, Instead, the USB cable on the motherboard and the USB connector in front of the chassis will cause this problem to occur, so it is recommended that you use the USB connector behind the chassis as much as possible or connect directly to the USB extension cord.
Step two: compatibility issues with the motherboard and Win7 system may also cause this problem, but not all motherboards will appear if, once your motherboard is incompatible with the Win7 system, such as the NF2 motherboard, Then you need to install the motherboard-specific USB2.0 driver patch, and then refresh the BIOS settings, the general Win7 system can be compatible.