Integrate USB drivers into windows 7 installation.The keyboard/mouse work elsewhere, but as soon as the install screen pops up it's unresponsive.
I suggest switching to Win 10. With new systems, like Ryzen, the unresponsive USB is driver related.
Disable secure boot in BIOS.I downloaded the windows 10 boot media from Microsoft's support site, but when I boot to the USB it just blue screen and says KERNEL_SECURITY_CHECK_FAILURE