I am using FX502VMZ, the latest version of window break the keyboard and probably other drivers as well.
Basic steps I took to fix the issue:
1) Reinstall the driver for keyboard (Didn't work at all)
2) Uninstalling the driver for keyboard, it works after restarting but no sound at all.
3) Just rollback to the previous version of window and it was fixed.
I hope ASUS will fix this issue, it will be problematic as the older system might not get an update for drivers. So doing a clean install of windows might end up having a broken driver and thus not working at all.