After installing the MS Firmware Update that popped up out of nowhere yesterday, with little or no documentation, I couldn't help but notice that my Marvell AVASTAR Wireless AC adapter quit working. My driver update utilities didn't notice anything amiss but by using a manual driver load (Update Driver Software, Browse my computer for driver software, Let me pick from a list..., then trying the drivers that showed up in that list in their order of appearance), I was eventually able to load a driver that worked -- for me it was the third one in the list that did the trick. Should anyone else find themselves in this situation, I can claim that this approach has worked at least once to restore the wireless interface to working condition.