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This is because you are plugging in a USB 2 device to a standard USB port, or a USB 3 device into a USB 2 port. The computer is just telling you that if you upgrade the hardware, the device will work faster. Its more of an information message than an error. Your device should still function fine.
go to control panel -device manager and see if you have all the latest drivers downloaded and if u dont then i would try and update them. if that doesnt work search up the specific driver u need online and download and install it.
I had a client with this same issue. However, her issue was that the top left USB port would only accept flash drives. Your external harddrive is probably not getting enough power from your USB port. Try using two USB ports (you can get a connector for this) to power up the external harddrive.
I have the same problem with the USB's not working. Suppliers say Motherboard problem. solved it by purchasing a PCMCIA to USB port. at least i now have 2 USB ports. you could probably get one with 3 ports.
did u install mother board drivers /not ? install M.bord drivers. chk all usb ports are connected to mother board. if problem persists go to decice manager expand USB then right click on usb driver select uninstall. right click on usb select scan for hard ware changes .system will install that drivers automatically.
As you have already stated that the port in question can run a standard optical mouse, the port seems to be working fine.
Sometimes the drivers for a USB device need to be installed for each USB port. Maybe you have installed these drivers for 3 of your 4 USB ports, but not for the one in question, result of which is the problem you face.