We recently built my friends computer. We started with Windows 8.1 and that was fine until the keyboard and mouse stopped working. We tried other USB ports, disabling the XHCI in BIOS, and other things but nothing worked. We decided to clean format and switch back to Windows 7.
We're now using...
64-bit
bios
bsod
clean format
drivers
faultyparts
hardware issues
memory issues
pc build
software issues
system issues
system restore
tech support
troubleshooting
update
usb
user experience
windows 7
windows 8.1
