Solutions to USB recognition problems in Windows® 7
What are the different ways to fix the USB recognition issue in Windows 7?
Sometimes, your computer, with the Windows 7 Operating System, might display an error message saying “USB device not recognized” whenever you plug in a USB mouse, keyboard, or other USB device. Your computer might stop recognizing your USB devices even if there is nothing wrong with the USB ports i.e. all your devices may still be getting power from those ports. So you should first start with the normal fixing methods, including uninstalling the drivers for my devices and reinstalling them. If that does not work, you shall then try 'System Restore'. This would help you if you have installed something and it has caused a conflict with the USB system drivers. If that too does not work, go to 'Device Manager' and uninstall all the devices under USB Controllers, restart the computer and reinstall the USB drivers.
Some common solutions to USB recognition errors in your PC are given below:
- Unplug computer from power supply
- Uninstall root hub drivers
- Delete device cache
Unplug computer from power supply
If you are in a situation where you receive the “USB device not recognized” message, there is no need to edit the registry, uninstall drivers, or anything if you are unaware of all that. You shall solve the problem easily by simply unplugging the PC from power supply. This does not mean that you just turn off your PC because modern computers don’t really turn off when you press the 'Power' button as the motherboard still gets power. The motherboard is where the hardware of the PC is connected to, including the USB ports. Sometimes the motherboard needs to be restarted. The small microprocessors on the motherboard would reload the drivers and your USB ports would be back to recognizing all the devices once it is turned off.
Uninstalling root hub drivers
The second option to fix the problem is to uninstall the root hub drivers. First, unplug all the USB devices from your PC. Go to 'Device Manager' in Windows 7 and uninstall each root hub USB driver. Then turn off your computer and unplug the cable from the power supply; don’t just shut it down. After this, reconnect the power supply cable and turn on your PC after 2-3 minutes. Then reconnect each external USB device i.e. mouse, keyboard, thumb drive, etc.
Another common reason why your USB drive stops working is that your device cache might be corrupt. If you have problems with installing devices and if your USB device stops working unexpectedly, you can just clear the device cache and it would work again. The device cache contains drivers of all the devices that are connected, including your USB device. If the cache is broken, your USB would stop working instantly. Then you can safely delete the 'INF'(Setup Information file) because it is only a cache file and would be re-created automatically. If you do not want to delete a system file, simply rename it. Finally, reboot and try to use your USB device again.
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