There is one other thing you may want to check. A lot of times, we assume that because everything functioned yesterday, that whatever software change happened must have affected it. But there is another possibility you may want to check. USB controllers do go bad just like every other component on your computer. It may just be coincidental that it happened at the time that you did your update. Or the USB controller on the device in question may be the problem --neither is out of the realm of the possible. Eliminate those possibilities by checking your device in a different computer. You didn't say whether or not the device is an external hard drive or a USB Flash drive or what, so I'm just speaking generally, but the biggest mistake you can make is assuming there's nothing wrong with your hardware --be it the motherboard or the device in question. I just finished restoring the corrupt partition of a flash drive today that was working on friday, but when the guy tried it yesterday morning it wouldn't show any of his files nor the partition. It's better to be thorough and consider every option and not just jump to the conclusion that an update canned your USB ports.