As I mentioned in Yikes! my laptop has been stalling when I kept attempting to install the Anniversary 1607 update. I've been trying for a few weeks and the result was always the same. After a couple of hours of downloading and installing the screen would go black at about 70% complete and the dreaded spinning wheel at the bottom of the screen showed up. I did hard resets and the software would reinstall the old Win 10. Last night I googled the problem and found a few Microsoft pages that offered fixes for my problem. I'm not the only one . Their advice was patience. Fortunately I kept reading. I found a non-Microsoft Web site that offered the same fix, but the discussion at the end of the page gave the real fix. Several people said the problem didn't go away until they removed their Logitech wireless mouse USB transmitter. I use a Logitech wireless mouse. I pulled the transmitter and the update completed. It's a huge update so it takes a long time to complete, but nowhere did Microsoft mention USB dongles. Any of you have trouble with this upgrade?