This issue typically appears when trying to install Windows 7 on newer hardware (Intel 6th-gen Skylake / AMD Ryzen or newer) or when USB ports stop working after a system update. What is "XHCI Root Hub 0"? XHCI (eXtensible Host Controller Interface) is the controller for USB 3.0 and later ports. The "Root Hub 0" is the logical connection point where USB devices attach.