So this problem ha been buggin' me for the last two days. When i boot up my pc, none of my USB devices (Keyboard, mice, headphones) works. So i plugged my old PS2 keyboard, wen into device management and found two not working devices:
I removed them, scanned for new hardware and all usb devices came back working. But now the problem comes back after each reboot. What can i do to fix it permanently?
I have had a similar problem with my laptop running Windows 8.1 Pro, 64 Bit.
Following a data backup using EaseUS Todo Backup (which was set to shut down my PC when finished), later on in the evening, when I turned on my laptop back on, all the USB devices were throwing up "USB device not recognised" errors. That included the internally connected USB devices such as my trackpad and built-in Webcam.
After uninstalling all the USB drivers and rebooting, the problem remained. I then found a video on Youtube that provided the answer, simply shut down the PC completely, remove the mains power supply (in my case I removed the laptop battery too) wait a few minutes, reconnect the power supply and then start the PC as normal.
I know that sounds too simple to be true but it worked for me (fingers crossed that the fix is permanent).