New driver failed to install in Windows update. However, it succeeded as a stand alone install. Not on PC now but it is a newer driver, may 2k15.
I know the last two digits are higher. Didn't test it extensively but seems good.
My number one suggestion will be : get your hand on a win 8.1 iso that includes all updates, and re install from scratch. Win 8.1 takes less than 20 minutes to install. Updates from 8 to 8.1 are most of the time glitchy .
If re install inst an option for you,then boot into safe mode, uninstall...