if this doesn't work,create a new offline account (admin),and delete your MSA,recreate your MSA then boot into that,you can delete the other account after that.
I still have not found one single bug on 10166. Bugs that I had on 162 are all now gone. EDIT: I take that back. I still have to re-size the TV screen on my HDMI connection in order for it to fit proper. The main monitor works great, and the secondary monitor works great as well, but the third monitor, which is a 55" TV has to be re-sized 7 ticks down, which is a bug I had on almost all of these builds this year. Other then that this build is the least bugs I have seen so far, and probably the fastest build I have used yet.
10166 runs solid no plm for 2 pc's Audio no issues Start Menu no issues. Action Center notification no issues. Shut down no issues. Explorer.exe no issues. System memory leak no issues. EDGE with 6+ tabs no issues. Feedback App no issues. Known issues. Insider Hub won't work after upgrades everytime Hub broken, Easy fix uninstall then reinstall.
realtime notifications for unreaded/new emails: not working mail counter for unreaded/new emails: not working system process: still using high amounts of memory in some systems start menu resize: still can be rezised completely horizontally in 1024x768 screen resolutions. lock screen: still display the time in AM/PM format instead of user country/date/time settings that could be 24 Hours or AM/PM format. title bars: still are totally white, instead of being transparent, also the colour remain in white even when you have multiple-windows opened, making hard to identify which one is the active window. windows defender: high system resource usage (CPU/RAM/HDD) while updating its defintions.