My wife has a windows 8 upgraded to windows 10, 4 yr old gateway desktop computer. After a power outage she had trouble starting it. It would get to the lock screen just before she could sign in, then the computer would go no further. We discovered neither the mouse (Logitech), nor the keyboard (Acer came with machine) would work, but they both worked on other computers. Found some old ones, not usb, and they worked. We could get into the computer. Everything else worked on the machine: tried from other machines a flash drive, dvd player, external hard drive, all usb. And they all also worked. We checked the device manager, and the usb devices ( wireless mouse and wired keyboard) were flagged. We tried to reinstall drivers, but failed. Looked for new drivers and found they were available but "could not be found" (computer's msg). Where do we go from here? Thanks for any help.